to-do不定式公开课---2018
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To do 不定式不定式由“to do+动词原形构成”其否定形式是“not to do”。
to do定式不能单独作谓语、不随主语的人称和数的变化而变化。
它有名词、形容词和副词的功能,但还保留动词的特征。
不定式可以带宾语或状语构成不定式短语,有时态和语态的变化。
不定式可作主语、宾语、状语、表语和定语。
不定式有时态和语态变化,具体结构如下表:1.不定式的用法1)作主语不定式短语作主语时,一般表示具体的、个别的、一次性的或具有将来意义的动作,谓语动词用单数。
To master a foreign Language requires painstaking effort (辛苦的努力).To combine theory with practice is a good way of learning.It+动词+宾语等+to do sthIt makes me sick to think about it.It does you a lot of good _____ _( swim) in the rivers.②It+be+表语+to do sthIt was rich to give up smoking.It was beyond me____ __( help)him.③It+be+表语+for sb. to do sth/for sth. to be done.It is important for you to attend that meeting.It is a good idea _ ___ the books ____ __ (give) to her.④It+be+表语+of+名词/代词+to do sthIt is kind of you to offer me this lovely holiday.It was careless_ ___ you ___ ___( leave) your book on the bus.2)作表语:①动词不定式作表语,其主语常常是wish,idea,task,purpose,duty,job等表示意向、打算、计划的词。
特殊疑问词+t o-d o1. 我们可以用“疑问词+动词不定式”结构做动词的宾语。
疑问词包括疑问代词 what 、which 、who 和疑问副词how 、when 、where 等。
但所有疑问词中,只有why 不可以和动词不定式连用。
2. 常和“疑问词+动词不定式”结构连用的动词及短语有:know 、learn 、see 、hear 、ask 、tell 、advise 、decide 、explain 、find out.另外,“疑问词+动词不定式”结构前,有时也可以是 sure 、clear 等的形容词 翻译:(1)我不知道该做什么。
I don’t know what to do.(2)你怎么知道在那里可以找到我?How did you know where to find me ?(3)我不确定下面该做什么。
I am not sure what to do next.3.注意:(1)有些动词,如advise, ask, show, teach, tell 等,其后可以接双宾语。
(2)有些疑问词,如what, which, whose, how many, how much 等,其后先接一个名词再接动词不定式。
(3)“疑问词+动词不定式”结构在句子中可以做主语和表语。
(4)“疑问词+动词不定式”结构可以改写成由该疑问词引导的从句。
练习:(1)Sandy 问我怎样去那。
Sandy asks me how to go there.(2)他不知道该带多少钱。
He doesn’t know how much money to take.(3)何时开始是一个问题。
When to start is a question.(4)我的问题是在哪里可以找到答案。
My question is where to find the answer.一、单项选择()1. —I will go to Harbin for my summer vacation. What about you ?—I haven’t decided where ______.A. goB. wentC. goingD. to go()2. I haven’t decided when _____a holiday yet.A. tookB. takingC. to takeD. take()3.—Can I help you ,dear?—Yeah, I do not know_____ a banana milk shake. Maybe you can help me.A. what to doB. when to makeC. how to makeD. why to do二、句型转换(同义句转换)1. He showed me how I can start the online tour.She showed me the online tour.2. I don’t know what he said.I don’t know _______ ______ _______.3. Tom forgot when he met his friendsTom forgot _____ ______ ______his friends.4. Sandy is wondering where she asks for help.Sandy is wondering _______ ________ ________ for help.5. Amy does not know how she writes the report.Amy does not know _____ _______ _______ the report。
不定式to-do-的用法备课讲稿语法(二)不定式to do的用法一:动词不定式的意义和结构1.不定式的语法意义:(1)在句中做以下成分:主语,宾语,表语,补足语,定语,状语(2)一“无”一“有”:无人称和数的变化有时态和语态的变化(3)仍然保留动词的特点:to—vt+主语;to—vi(+状语)2.结构:肯定式to do ;否定式 not\never to do二:不定式的时态和语态变化时态:与谓语动词相比,动词不定式的时间在谓语动词之前,同时之后进行。
1.一般式:动词不定式表达的动作发生在主句谓语动词之后或同时发生。
2.完成式:动词不定式表达的动作发生在主句谓语动词之前。
eg:I’m sorry to have kept you waiting so long.3.进行式:动词不定式表达的动作发生在主句谓语动词之前。
eg:They seem to be getting along quite well.4.完成进行式:动词不定式表达的动作发生在主句谓语动词之前且进行.语态:动词不定式与主句主语的关系三.句子结构(一)主语:1.不定式作主语,谓语动词用单数(非谓语动词to do ,doing,done只有前两者可以作主语,done相当于形容词)。
2.不定式作主语,常用it形式主语,把 to do 放于句尾。
句式:(1)It is+ 形容词+for sb.to do sth.做某事对于某人来说是怎样的,此处为客观性质的形容词,如:hard,difficult,easy等(2)It is+形容词+of sb. to do sth.意思同上,此处为表示人得性格,本质特征,如:kind,friendly,selfish等Eg:1>It is hard for me to learn math .2>It is kind of you to help me to study.(3)It is +名词+to do 做某事是…Eg:It is our duty to look after the old.(4)It takes/took+主语+时间+to do.花费多长时间做某事Eg:It takes me five hours to finish the homework.(三)宾语1.直接to do 作宾语的动词(主语+vt+todo):want/plan/ask/agree/afford/arrange(安排)/determine(决定)/decide/expect/fail/hope/happen/manage(设法)offer/object(反对)/promise(许诺)/wait/refuse等2.若to do 作宾语,且后边又跟宾语补足语时,此时用it作形式主语,把to do 放在后面,即构成结构主语+vt+it+宾语补足语+to do (think,consider,make,find,feel)。