最新牛津译林版八年级下Unit1 Grammar精品课件(共24张PPT)

I have not just eaten it.
You have not cleaned up the window.
She/He/ has not visited Beijing three times.
It has not slept three hours. 结论：现在完成时的否定句结构为 主语 + have not/ has not+ 过去分词+... ________________________________________
观察与思考
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How long have you lived?
What has she/he eaten for breakfast?
What has the government done to part of the town
centre? Where has she travelled recently? 结论：现在完成时的特殊疑问句结构为 特殊疑问词 +have/has+主语+过去分词+... ________________________________________
She/He/ has visited Beijing three times.
It has slept three hours. 结论：现在完成时的肯定句结构为 主语 + have/ has + 过去分词+... ________________________________________
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take—took—taken speak —spoke—spoken
sing—sang—sung drive—drove—driven be—was/were—been go—went—gone
C.过去分词、过去式与动词原形一样
cut—cut—cut
let—let—let
put —put—put
read—read—read
A.过去分词与过去式形式一样 不 规 则 变 化 have—had—had make—made—made find—found—found meet—met—met spend —spent—spent say—said—said hear—heard—heard leave—left—left
B.过去分词与过去式形式不一样 不 规 则 变 化
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结论：现在完成时的一般疑问句结构为
Have/Has+ 主语+过去分词+...？ __________________________________
__________________________________ 肯定回答：Yes, 主语+has/have.
否定回答：No, 主语+hasn’t/haven’t. __________________________________
Review
1. How long has Mr Chen lived in Sunshine Town? He has lived there since he was born. 2. What has the government done to part of the town centre? The government has turned part of the town centre into a new park. 3. Why does Mr Chen think it is impossible to see his old
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—Have you eaten it? —No, I haven’t./Yes, I have. —Has she/he/ visited Beijing three times? —No, she/he hasn’t./Yes, she/he has. —Has it slept three hours? —Yes, it has./No, it hasn’t
现在完成时定义
现在完成时定义三要素： 1.表示到现在为止已经完成或刚刚完成的动作。 2.一件发生在过去的事情对现在产生影响。 3.一个动作开始于过去，并持续到现在(也许还将 持续下去)。
观察与思考
1
I have just eaten it.
You have cleaned up the window.
friends as often as before? Because most of his old friends have moved away.
Present perfect tense
1. I have lived here since I was born. 我自从出生就一直居住在这里。 过去发生的动作一直延续到现在，有可能继续延续下去。 2. Eddie has eaten my food. 埃迪吃了我的食物。 过去发生的动作，对现在造成影响。 3.I have already read this book many times. 我已经看过这本书很多次了。 某个动作迄今为止发生过多少次。
初中英语译林版八年级
Unit1 Past and present
Grammar
学习目标
1.掌握词汇：yet, recently, past 词组：learn more about, over the past century
2. 掌握Байду номын сангаас在完成时的基本结构、用法和动词过去分词的
变化规律。 3. 能够在语境中正确运用现在完成时。 4.理解并运用常和现在完成时连用的时间表达方式。
过去分词的变化规则
(1)一般动词，在词尾直接加“ ed ”。 work---worked---worked
规 则 变 化
(2)以“ e ”结尾的动词，只在词尾加“ d ”。 live---lived---lived (3)以“辅音字母 + y ”结尾的动词，将“y” 变 为 “i”，再加“ ed ”。 study---studied---studied (4) 重读闭音节结尾，末尾只有一个辅音字母， 先 双写该辅音字母，再加“ ed ”。 drop---dropped--dropped