because，since，as，for 作“因为”解释时，有以下区别：
1）for 与其他不同
1、because, since, as 为从属连词，for为并列连词或介词，且for不放句首（除For what？“为啥？”之外）
2、for sth （由于某事）相当于because of、on account of、due to、owing to、for the sake of、result from、as a result of
3、for+并列句时，用来附带解释前一句的情况，有附带推理的语气
It must have rained, for the ground is wet.天一定下过雨，因为地面是湿的。（外国权威例句）
试比较：The ground is wet because it has rained. 此句知道下雨的原因，而上句是推理出地面湿的原因。
2）since 由于，既然（多数可译为“既然”）
1、译为“由于”时，不放句首时可用because、as代替
2、译为“既然”时，只用since，相当于now that
Since I have no money, I can’t buy a ny food. 由于我没钱，所以我不能买食物。Since it is so hot, let's go swimming. 既然天气这么热,我们去游泳吧。
3）because
1、针对情况解释原因（非推理所得的原因），有明显的因果关系
2、从句不放句首
3、能用于强调句，since，as，for不能
It is because John is honest and diligent that he is popular with his friends.
正是因为约翰的诚实勤奋使得他受到朋友们的欢迎。
4）as 可译为“鉴于”
译为“由于”时一般与since，because没啥区别，可互换。若从句的主语为it 时，用as As it was already rahter dark, we decided to stop at the temple for the night. 由于天气已经相当晚了，我们决定在庙里待一夜。
as用法广泛，可做非限制性定语从句的引导词，还有“当...的时候”的意思，相当于when；还有“随着....”，“正如....”，“虽然...”“作为...”等意思
综上，因果关系明显的最好用because；“既然”只用since；对推测附带解释的只用for；因果关系不明显的可用because，since，as
ps：网上说：语气关系because＞since＞as＞for，这个说法很不靠谱，因为所以科学道理，要是外国人说一下“因为所以”还要分四种情况，那他们可真是活神仙啊。
（原创编辑：Wu Thousand）
四：介词 介词又叫前置词，是一种虚词。介词分为三种，一种是简单介词，如at, in, on, beside, to , for 等；另一种是短语介词，即由两个以上的词组组成的短语，如in front of, because of, out of, instead of等；还有一种叫二重介词，如until after, from behind等。 （一）介词的句法功能 介词不能独立在句中做成份，介词后必须与名词、代词、或动名词构成介词短语在句中充当一个成份，表示人、物、事件等与其它人、物、事件等之间的关系。 1、作定语：The book on the table is mine. 2、作状语：We have breakfast at seven.（表时间）；They were late for meeting because of the heavy rain.（表原因）；They started the machine by pressing the button.（表方法） 3、作表语：My dictionary is in the bag. 4、作宾语补足语：I found him in the office. （二）主要介词区别 1、表示时间的at, in, on：at表示片刻的时间，如：at 8 o’clock ，常用词组有：at noon, at night, at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year等。in表示一段的时间，如：in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, in the future等。on总是跟日子有关，on Monday, on Christmas morning, on the following, on May Day, on a warm morning等。 2、表示时间的since和from：since表示从过去到现在的一段时间的过程，常与现在完成时连用。from表示从时间的某一点开始，不涉及与现在的关系。一般多与现在时、过去时、将来时连用。如：I hope to do morning exercises from today./ We have not seen each other since 1995. 3、表示时间的in和after：两者都表示“在（某个时间）之后，区别在于in表示“在（一段时间）之后”，而after则表示“在（某一具体时间点之后）”，in短语和将来时态连用，after 短语和过去时态或将来时态连用。如：We’ll be back in three days./ After seven the rain began to fall./ What shall we do after graduation? 注意：after有时也可以表示在一段时间之后（常用在过去时里）。如：After two months he returned. 4、表示地理位置的in, on, to：in表示在某范围内，on指与什么毗邻，to指在某环境范围之外。如：Changchun is in the northeast of China./ Mongolia is on the north of China./ Japan is to the east of China. 5、表示“在……上”的on和in：on只表示在某物的表面上，而用in表示占去某物一部分。如：There is a book on the piece of paper./ There is an interesting article in the newspaper./ He dug a hole in the wall. 6、表示“穿过……”的through和across：through表示从内部通过，与in 有关；across则表示从一端至另一端在表面上的通过，与on有关。如：Water flows through the pipe./ The old man walked across the street. 7、in the corner, on the corner, at the corner：in the corner 表示在角落里，in指角的内面；on the corner表示“在角上”，on指的不是内面，也不是外面，而含内外兼有之意；at the corner 指“在拐角处”，at指的是拐角外附近的外面。如：The lamp stands in the corner of the room./ I met with him at the street corner./ He sat on the corner of the table. 8、in the end, at the end of, by the end of：in the end作“最后”、“终于”解，可单独使用，后不接介词of；at the end of 表示“在……末梢”，“到……尽头”，既可指时间，也可以指地上或物体。不可单独使用；by the end of 作“在……结束时”，“到……末为止”解，只能指时间。不
初中英语学习材料 madeofjingetieji since 和for 的用法(用于现在完成时) 表示过去已经开始持续到现在的动作或状态常用的时间状语有：for, since, how long, so far, these days等。 1. since : a).since +时间点①年代②时刻数③一段时间+ago b).现在完成时：主句(主语+have/has +延续性动词的过去分词)+ since +从句一般过去时 c) It’s +时间段+since +短暂性动词的过去式 d).时间段+has passed +since +短暂性动词的过去式 for +一段时间 练习： 用since和for填空 1) ______ two years 2) _______ two years ago 3) _______ last month 4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock 7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children 10) _____ lunch time 11) ______ she left here 12). He has lived in Nanjing ________ the year before last. 13). I’ve known him __________ we were children. 14). Our teacher has studied Japanese _________ three years. 15). She has been away from the city ___________ about ten years. 16). It’s about ten years __________ she left the city. 2. for: for +一段时间= since +一段时间+ ago 3. 与时间段连用时，短暂性动词应改为相应的延续性动词。 1) come/go to ------ be at /in 2)leave ----be away from 3)buy ----have 4) borrow /lend -----keep 4)open ---be open 5)close---be closed 6) die---be dead 7) start/begin ----be on 8) join—--be in /be a member of /be a soldier 9) become –be 10) fall asleep ---be asleep 11)catch a cold – have a cold 12) have/has gone to → have been in 13) put on → wear14) finish/end → be over 15) marry → be married 练习：.短暂性转换延续性 1) His grandfather died two years ago . His grandfather has ____ ____ for two years. _____two years _____ his grandfather ____. Two years ____ ____ ____ his grandfather _____. 2) I became a teacher in 2000. I ________ __________ a teacher for _________ _________. 3) The shop closed two hours ago. The shop ________ _________ _________ for _________ _________. 4) The door opened at six in the morning. The door ________ ________ ________ for six hours. 5)He left Fuzhou just now. He _______ ________ ________ _________ Fuzhou for five minutes. 6)The film began two minutes ago. The film ____ ____ ____ for ____ ____.How time flies! 7)They borrowed it last week. They _________ _________ it since __________ __________. 8)I bought a pen two hours ago. I _________ _________ a pen for ________ __________. 9)They married in 1990. They ________ _________ __________since _________. 10)The meeting finished at six. The meeting ________ ______ ______ for six hours. 11)My brother joined the army two years ago.
because、since、as、for的用法区别 because、since、as、for这几个词都是表示“原因”的连词，语气由强至弱依次为：because→since→as→for。其中because、since和as均为从属连词，引导原因状语从句；而for是并列连词，引导并列句。 ?because because表示直接原因，它所指的原因通常是听话人所不知道的，其语气最强。常用来回答why的提问，一般放在主句之后，也可以单独存在例如： (1)Istayed at home because it rained. 因为下雨，我呆在家里。 (2)B ecause Lingling was ill, she didn’t come to school. 玲玲因为生病，没有上学。 (3)—Why is she absent? 她为什么缺席? —Because she is sick. 因为她病了。 (4)此外，在强调句型中只能用because。例如， It was because I missed the early bus that I was late for school. 我上学迟到是因为我错过了早班车。 ?since since侧重主句，从句表示显然的或已为人所知的理由，常译为“因为、既然”，语气比because稍弱，通常置于句首，表示一种含有勉强语气的原因。例如： (1)Si nce he asks you, you’ll tell him why. 他既然问你了，那就告诉他为什么吧。 (2)Si nce everyone is here, let’s start. 既然大家都到齐了，我们就是出发吧。 (3)Since I understood very little Japanese, I c ouldn’t follow the conversation. 我日语懂得不多，因而听不懂对话。 ?as as是常用词，它表示的“原因”是双方已知的事实或显而易见的原因，由于理由不是很重要，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”。从句说明原因，主句说明结果，主从并重。例如：
英语介词练习题含答案 一、初中英语介词 1．Look at the picture on the right! She is going _______. A. into the library B. out of the post office C. into the supermarket 【答案】C 【解析】【分析】句意：看右边的图画！她要去超级市场。A. into the library进图书馆；B. out of the post office走出邮局；C. into the supermarket进超市。根据右边的图片可以看到这名妇女正要走进超市，结合选项，故答案为C。 【点评】考查图片辨析。看懂图片，理解题意，注意熟记表示地点的名词。 2．I'll be at home __________ Sunday morning. You can phone me then. A. on B. in C. at D. to 【答案】 A 【解析】【分析】句意：在周日早上我将在家，那时你可以给我打电话。on+具体时间；in+the+morning/afternoon/evening，在早上/下午/晚上；at+时间点。Sunday morning指的是周日早上，指的是具体日期，所以用on，故选A。 【点评】考查介词辨析，注意平时识记on、in、at的区别。 3．John often takes a walk _______ his grandpa after dinner. A. to B. for C. along D. with 【答案】 D 【解析】【分析】句意：约翰经常晚饭后和他的爷爷散步。A.朝；B.为了；C.沿着；D.和……一起。根据his grandpa，可知此处应是晚饭后跟爷爷散步，故选D。 【点评】考查介词辨析。注意句子涉及到with的词义和用法。 4．Humans can not make progress dreams. A. with B. without C. through D. about 【答案】 B 【解析】【分析】句意：没有了梦想，人类就不会进步。A.带着，有；B.没有；C.通过；D.关于。梦想是人类前进的动力，根据Humans can not make progress，可知人类不会进步，是因为没有梦想，应会使用介词without，故答案是B。 【点评】考查近词辨析，注意识记介词without的用法。 5． , I found the job boring, but soon I got used to it.
现在完成时态中的since 与for 1. 实例： We have studied English for more than 2 years. 我们学英语已有两年多时间了。 She has been ill since last Sunday. 她从上周星期天一直病到现在。 2. 用法说明： (1) 介词for 短语表示一个时间段，指某个动作或情况到现在为止已持续了多久，提问时用how long；since 作为介词，接一个时间名词，作为连词，引导一个时间状语从句(从句动词一般是短暂性动词)，since 表示“自…以来”，指某个动作或情况从过去某一点时间一直持续到现在，因此，与for 或since 引出的时间状语连用的句子(或主语)谓语动词必须是持续性的(如上面两句中的动词study 和be) (2) 英语中有些动词的意义不能持续，表示的是一瞬间就结束的动作，这些动词被称为非持续性动词或短暂性动词，常见的如come, leave, go, lose, see, begin, start, arrive, bec ome, die, buy, borrow, close, join, reach, fall, get up 等。这类动词可以用于完成时态，但在肯定句中不能与表示动作延续的时间状语for 或since 短语连用。如：正：He has come back. 他已回来。 误：He has come back for three days. 若要表示“他回来已三天了”这样的意思，可以将动词改为延续性动词，或改变时间状语，或改用别的句型等，如译为： He has been back for three days. (改变谓语动词) He has been back since three days ago. (改变谓语动词) He came back three days ago. (改变时间状语及动词时态) It’s three days since he came back. (改变句型) (3) 非持续性动词用于完成时态，在肯定句中不能与for 或since引出的短语(或句子)连用，但在否定句中是可以的，因为一个非延续性动词一旦被否定即成为状态，而状态总是可以延续的。如：(https://www.doczj.com/doc/9b18704007.html,) I haven’t seen him for a long time. 我很久没见到他了。 He hasn’t come here for some time. 他有段时间没来了。 I haven’t heard from her since she left. 自他离开以后，我一直没收到她的来信。
Unit 7 The unknown world 语法练习一．基础巩固。 ( )1. I hate travelling by air_____ you usually have to wait for hours before the plane takes off. A. because B. though C. until D. Unless ( )2. Because it is hot, _____ we decide to go swimming. --Can I join you? A. so B. thus C./ D. for ( )3.—Why you are absent? --_____ I am ill. A. Since B. For C. As D. Because ( )4.____ everyone is here, let’s begin. A. But B. Since C. So D. If ( )5.She was praised______ she often helped others. A. but B. for C. or D. if ( )6.______ the heavy snow, we didn’t go to school. A. Because B. Because of C. For D. Since ( )7.Because it is raining,_____ we have to put off the sports meeting. A. so B./ C. and D. then ( )8.--_______it is late , I should go home now. --Oh, do you have to? A. Since B. Or C. Because of D. But ( )9.—The sun must have set,____ it is growing dark. --- Yes, and it’s 6 o’clock now. A. for B./ C. however D. thus ( )10.--- I will go to the party alone ____ you don’t want to go. A. until B. since C. however D. whether ( )12. The man can’t get on the bus ______ there is no room on it. A. though B. because C. until D so that ( )13. ______ her daughter hadn’t come back, ______ she looked worried. A. Because, / B. Because, so C. Though, but D. Though, / ( )14._______ you’ve got a chance, you might make full use of it. A. Now that B. After C. Although D. As soon as ( )15. He found it difficult to read, _______ his eyesight was beginning to fail. A. and B. for C. but D. or ( )16. A man cannot smile like a child, ________ a child smiles with his eyes, while a man smiles with his lips alone. A. so B. but C. and D. For 形容词、副词综合复习与训练 ( )1．Water is the cheapest drink. And it's also ________. A．healthier B．healthiest C．the healthier D．the healthiest ( )2．—How do you feel about the movie？
一、时态讲解：现在完成时 （1）构成：现在完成时由助动词have + 过去分词构成，助动词have 有人称和数的变化。第三人称单数用has，其余用have. 现在完成时的否定式直接在助动词后面加上not、疑问式是把助动词have/has提到主语之前。以study 为例，其否定式、疑问式和简单回答形式如下： 1）现在完成时通常表示在说话之前已经完成的动作或存在的状态。说话人强调的是该动作或状态对现在的结果或影响。 My daughter has just gone out. 我女儿刚出去。 I’m sure we’ve met before. 我肯定我们以前见过面。 She has arrived. 她到了。 2）表示持续到现在的动作或状态，往往和包括现在在内的表示一段时间的状语连用，如recently, already, just, la tely, for…, since…,yet等。如： I haven’t heard from her these days. 这些日子我没有收到她的信。 We haven’t seen you recently. 最近我们没有见到你。 They have been away for two years. 他们离开已经两年了。 She has been with us since Monday. ★注意： a)since和for的区别 since后接时间点，如1993，last term, yesterday, the time I got there for后接一段时间，表示“长达多久”，如ten years, a while, two days等。 Exercise: 用since和for填空 1. Jim has been in Ireland ______ Monday. 2. Jill has been in Ireland ______ three days. 3. His aunt has lived in Australia ______15 days. 4. Mary is in her office. She has been there ______ 7 o'clock. 5. India has been an independent country ______1974. 6. The bus is late. They've been waiting ______ 20 minutes. 7. Nobody lives in those houses. They have been empty ______ many years. 8. Mike has been ill ______a long time. He has been in hospital ______ October. 1. since 2. for 3. for 4. since 5. since 6. for 7. for 8. since 2）表示短暂意义的动词如arrive, leave, borrow, buy, begin, start, die等，在完成时当中不能和表示一段时间的状语连用，因为它们表示的动作不可能持续。因此，不能说：
S i n c e-和-f o r-的用 法及区别 -CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN
Since 和 for 的用法及区别： 一，since 的四种用法 1，since + 过去一个时间点（如具体的年、月、日期、钟点、ago. 1990 , last month , half past six I have been here since 1990. 1990起，我一直在这儿。 2，since+ 一段时间+ago I h a v e b e e n h e r e s i n c e f i v e m o n t h s a g o。自从五个月前，我已经在这儿了。 3，since+从句Great Changes have taken place since you left. 自从你走后，已经发生了很大的变化。 4，It is +一段时间+since从句 I t i s t w o y e a r s s i n c e I b e c a m e a n E n g l i s h t e a c h e r.我成为英语老师有两年了。 二，Since 和for区别 1，Since +时间点，具体时间 “自从、、、、以来，从、、、以后”用来说明动作起始时间 I have been in Beijing since 2010. 2，For + 时间段，用来说明动作延续时间长度，因此句中的谓语动词，也应该是延续性动词。 I have been in Beijing for one year。 We have learnt English for about three years. I have been here for 3 days. (对) I have arrived here for 3 days.（误） 三，延续性动词和终止性动词的概念 英语中，动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词和终止性动词。 延续性动词 表示能够延续的动作，这种动作可以延续下去或产生持久影响。如：
现在完成时练习题 I. 用never, ever, already, yet, for, since填空 1.I have _______ seen him before, so I have no idea about him. 2.Jack has _________ finished his homework ________ an hour ago. 3.Mr. Wang has taught in this school ________ ten years. 4.“Have you ________ seen the film”“No, I have ________ seen it.” 5.“Has the bus left _______”“Yes, it has _________ left.” II. 用since和for填空 A. 1) ______ two years 2) _______ two years ago 3) _______ last month 4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock 7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children 10) _____ lunch time 11) ______ she left here B. 1. He has lived in Nanjing ________ the year before last. 2. I’ve known him __________ we were children. 3. Our teacher has studied Japanese _________ three years. 4. She has been away from the city ___________ about ten years. 5. It’s about ten years __________ she left the city. 6. I've been practicing the piano since 10∶30. 7. Mario has been running ____ 15 minutes. 8. Sarah has been sleeping ____ 9∶00. 9. Dale has been talking on the phone ____ five minutes. 10. Louie has been studying Chinese ____ he was six years old. 11. I've been watching you ____ ten minutes. 12. She?has?done?her?homework?_________?two?hours. 13. Tom?has?been?swimming??_________?an?hour. 14. They?have?learnd?English?________?they?came?to?school. 15. They?have?been?in?the?room?__________8?o’clock. 16. We?have?studied?English?_________several?years. 17. I?have?been?living?in?Xi’an?_________I?was?born. 18. She?has?worked?here?_________?2006. 19. Mary?has?been?running?_________?she?came?here. 20.?Ann?has?been?learning?English?since?2003.（选出同义词组） A.?for?2003 B.?since?about?6?years? C.?6?years?ago D.?for?about?6?years III. 用过去时或现在完成时填空： 1. “_________ you __________ (write) a letter to your aunt yet” “Yes, I ___________. I ________________ (write) one last week.” 2. “_________ he ___________ (finish) his homework”“Not yet.” 3. “_________ they ever __________ (be) abroad”“Yes, just once.” 4. Your father _________ just ___________ (finish) his work. 5. Your father _________ (finish) his work just now. 6. Last term I __________ (learn) many English words. 7. They ____________ (not read) the interesting books yet.
because, as, for, since这几个词都是表示“原因”的连词，语气由强至弱依次为： because→since→as→for;其中because, since, as均为从属连词，引导原因状语从句；而for 是并列连词，引导并列句。 1. because表示直接原因，它所指的原因通常是听话人所不知道的，其语气最强。常用来回答why的提问，一般放于主句之后，也可以单独存在。例如： (1)I stayed at home because it rained. 因为下雨我呆在家里。 (2)Because Lingling was ill, she didn”t come to school. 玲玲因病，没有上学。 (3)�Why is she absent? 她为什么缺席？ �Because she is sick. 因为她病了。 此外，在强调句型中，只能用because。例如： (4)It was because I missed the early bus that I was late for school. 我上学迟到是因为我没有赶上早班汽车。 2. since侧重主句，从句表示显然的或已为人所知的理由，常译为“因为”、“既然”，语气比because稍弱，通常置于句首，表示一种含有勉强语气的原因。例如： (1)Since he asks you, you”ll tell him why. 他既然问你，那就告诉他为什么吧。 (2)Since everyone is here, let”s start. 既然大家都到齐了，我们就出发吧！ (3)Since I understood very littl e Japanese, I couldn”t follow the conversation. 我日语懂得不多，因而听不懂对话。 3. as是常用词，它表示的“原因”是双方已知的事实或显而易见的原因，或者理由不是很重要，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”。从句说明原因，主句说明结果，主从并重。例如： (1)We all like her as she is kind. 我们都喜欢她，因为她善良。 (2)As I had a cold, I was absent from school. 因为我感冒了，所以没去上课。 (3)As Xiaowang was not ready, we went without him. 由于小王没有准备好，我们只好不带他去了。 4. for用作连词时，与because相似，但它所表示的原因往往提供上文未交待过的情况。for 不表示直接原因，表明附加或推断的理由，因此for被看作等立连词，它所引导的分句只能
现在完成时Since和for的用法 Since 和for 的用法 表示过去已经开始持续到现在的动作或状态常用的时间状语有：for, since, how long, so far, these days等。 Since+过去点的时间，for+一段时间(数词+量词)，此划线部分用how long提问。 一、since短语或从句表示过去的动作延续至今，since之后的时间为一点。如： Mr. Smith has worked here since 1984. 1984年以来，史密斯先生一直在这工作。 He’s learned about 5,000 English words since he went to college. 他上大学以来大约学了五千个英语单词。 二、for短语表示动作延续多长时间，for的宾语为时间段。如： We have known each other for twenty years. 我们认识有二十年了。 I haven’t seen her for a long time. 我好久没有见到她了。 练习：用since和for填空 1) ______ two years 2) _______ two years ago 3) _______ last month 4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock 7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children 10) _____ lunch time 11) ______ she left here 1. He has lived in Nanjing ________ the year before last. 2. I’ve known him __________ we were children. 3. Our teacher has studied Japanese _________ three years. 4. She has been away from the city ___________ about ten years. 5. It’s about ten years __________she left the city. 2.短暂性转换延续性
“SI因为”because for as since because, as, for, since这几个词都是表示“原因”的连词，语气由强至弱依次为：because→since→as→for;其中because, since, as均为从属连词，引导原因状语从句；而for 是并列连词，引导并列句。 1. because表示直接原因，它所指的原因通常是听话人所不知道的，其语气最强。常用来回答why的提问，一般放于主句之后，也可以单独存在。例如： (1)I stayed at home because it rained. 因为下雨我呆在家里。 (2)Because Lingling was ill, she didn”t come to school. 玲玲因病，没有上学。 (3)——Why is she absent? 她为什么缺席？ ——Because she is sick. 因为她病了。 此外，在强调句型中，只能用because。例如： (4)It was because I missed the early bus that I was late for school. 我上学迟到是因为我没有赶上早班汽车。 2. since侧重主句，从句表示显然的或已为人所知的理由，常译为“因为”、“既然”，语气比because稍弱，通常置于句首，表示一种含有勉强语气的原因。例如： (1)Since he asks you, you”ll tell him why. 他既然问你，那就告诉他为什么吧。 (2)Since everyone is here, let”s start. 既然大家都到齐了，我们就出发吧！ (3)Since I understood very little Jap anese, I couldn”t follow the conversation. 我日语懂得不多，因而听不懂对话。 3. as是常用词，它表示的“原因”是双方已知的事实或显而易见的原因，或者理由不是很重要，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”。从句说明原因，主句说明结果，主从并重。例如：
藤县第三中学微课设计模板（参考使用） 录制时间： 2016年6月15日微课时间：7.54分钟微课名称for 和 since的用法 知识点描述for 和 since 在现在完成时态中的用法 知识点来源学科：英语年级：八年级教材：人教版章节：第十单元页码： 73 □不是教学教材知识，自定义：是 基础知识听本微课之前需了解的知识： 现在完成时态的用法以及for和since定义和用法 教学类型√□讲授型□问答型√□启发型□讨论型√□演示型□联系型□实验型□表演型□自主学习型□合作学习型□探究学习型□其他 适用对象学生：本微课是针对本学科平时成绩多少分的学生？ □40分以下□40-60分□60-80分 √□80-100分□100-120分□120-150分 教师：□班主任□幼儿教师√□普通任课教师□其他其他：√□软件技术□生活经验□家教□其他 设计思路这是语法课，因此我用归纳法讲解，通过例子，然后总结，再比较，最后得出结论。 教学过程 内容画面时间 一、片头（20秒以内）内容：您好，这个 微课重点讲解辨 析for和since的 用法 第 1 至张PPT 2秒 二、正文讲解（4分20秒左 右）第一节内容：辨析 for和since的用 法 第 2 至11 张PPT 315 秒 第二节内容：典型 例子 第 12 至 14张PPT 116 秒
第三节内容：总结内容第 15 至张PPT 40 秒 三、结尾（20秒以内）内容：感谢大家能 认真的听完这个 微课，希望大家回 去后多做练习加 以巩固。 第 16至张PPT 1 秒 教学反思（自我评价）本微课通过用PPT的方式讲解了for和since的用法，因为是辨析两个单词的用法，因此我用了归纳法进行讲解，让学生在例子中发现规律，然后进行总结。但是，在讲解的过程中，我所举的例子可能太少了，给学生思考和练习的时间也很少，中等以下的学生可能对知识点还不是很理解。通过这节微课，我觉得在以后教学中，我要认真分析学生的认知能力，顾及大部分学生，然后寻找更好的教学方法，或者在讲解释可以使用多种方法，归纳法或者演绎法等，让学生理解所教授的内容。另一个不足之处是，我在制作课件的时候并没有很好地运用多媒体技术，因此，在以后的教学中，我还要多学习多媒体在教学中的运用。