B7U1Grammar非谓语动词to do
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Book 7 Unit 1 Grammar 动词不定式语法要点1.动词不定式用法框架①动词不定式的时态和语态 ②动词不定式句子成分用法 ③动词不定式的省略 ④动词不定式否定形式 ⑤动词不定式的疑问词+动词不定式 ⑥动词不定式的特殊用法 ⑦动词不定式的高考考点 2.补充要点 (1)基本形式(2)动词不定式的需特别注意的用法① 动词作表语,与其逻辑主语有被动关系,动词不定式用被动式。
The problems remain to be unsettled. ② 作宾语1)在下列动词后,常用动词不定式作宾语:want,need,offer,hope,wish,expect,like,hate,try,manage,forget,remember,intend,plan,pretend,prefer, agree, refuse, learn 等。
2)在复合结构中,可用it 作形式宾语,而真正宾语放在后面。
I feel it my duty to help others. ③作定语1)动词不定式作定语,如果与其前面修饰的名词逻辑上有动宾关系,而动词是vi.,前面所修饰的名词为地点、工具等,则vi.后要+介词。
Pass me a piece of paper to write on.2)如果动词不定式的逻辑主语是句子的主语,即动词不定式中的动词是句子主语做的,动词不定式用主动形式;如果动词不定式的逻辑主语不是句子的主语,即动词不定式中的动词不是句子主语做的,动词不定式用主动形式,则动词不定式用被动形式。
Attention, please! I have something to say.---I am going to Beijing. Do you have anything to be taken to your aunt? ---Thanks. I have some taken last week ④作状语作结果状语,表示出人意料或不太好的结果,前面常加only 表示强调;而现在分词(doing) 表示自然产生的结果。
非谓语动词todo的用法小结非谓语动词不定式(to do)的用法小结I.不定式的语法意义1.不定式具有名词、形容词、副词的特征,在句中可作主、宾、定、表、补和状语。
2.没有人称和数的变化,在句子中不能作谓语,但有时态和语态的变化。
3.仍保留动词的特征,即可有自己的宾语和状语,和他们一起构成不定式短语。
II. 不定式的否定式not to doIII.不定式的时态和语态1.一般式(to do/to be done)表示动作或状态与谓语动词的动作或状态同时发生或发生在其后。
2.完成式(to have done/to have been done)表示动作或状态在谓语动词的动作或状态之前。
3.进行式(to be doing)表示动作谓语动词所表示的动作或状态发生时正在发生。
4.完成进行式(to have been doing)表示在谓语动词的动作或状态发生之前开始进行的行为,到谓语动作发生时,可能停止,也可能会持续下去。
IV.不定式的功能1.作主语:(1)to do可直接作主语,表示特指一个具体动作。
eg.To swim in that river is very dangerous.To study English well isn’teasy.(2) 用it作为形式主语,而把真正的不定式主语放到句中。
常见的有6种。
It is +adj+ to do sth.eg.It is nice not to be dependent onothers.It is +adj+for sb to do sth.eg.It is not hard for one to do a bit of goodIt is +adj+of sb to do sth.eg. It is silly of you to believe him.= You are silly to believe him.It is +noun+to do sth.eg.It was not his habit to ask people for things.It+动词(+宾语)+ to do sth.eg.It took me a year to finish writing thebook.It is+介词短语+to do sth.eg.It is beyond my power to answer this question.2.作表语:to do作表语很普遍,多数情况下可换作主语eg.Her job is to teach us maths.To teach us maths is her job.3.作宾语:to do作宾语直接跟在vt 动词后面。
非谓语动词之动词不定式(to do)的用法非谓语动词是指在句子中不是谓语的动词,主要形式有:不定式、动名词和分词(现在分词和过去分词)。
1.“to do”动词不定式的变形2.动词不定式的用法(1)充当主语(一般会用it 当形式主语)To swim here is dangerous. =It is dangerous to swim here.To pass this English exam is unlikely. =(2)充当表语(多数情况下,可以转换成动词不定式做主语)My job is to help with your English learning.To help with your English learning is my job.(3)充当宾语(只能做某些动词的宾语,一般不做介词的宾语;有时用“it”做形式宾语)I decided to attend this meeting last night.I find it necessary to learn a foreign language.注意:当以下动词欲接动词作宾语时,只能跟不定式作宾语。
decide, determine, learn, wish, hopeagree, plan, pretend, dare, refuse, failprepare, try, manage, help, promiseoffer, beg, demand, afford, arrange, be supposed(4)充当宾语补足语I persuaded him to make a speech in public.注意:在感官动词/使役动词/help后(see, hear, watch, notice, make,have, let后不定式做宾补时,可省略“to”)I saw them have a disagreement on who should sweep the floor. (我看到了他们争论的整个过程)但,感官动词后面也可接Ving形式,表示正在进行。
(一)非谓语动词概述动词在句中除充当谓语外,还可以起名词、形容词或副词的作用。
在句中充当主语、宾语、表语、补语、定语和状语。
这就是动词的非谓语形式。
当句中需要用某种动作作主语、宾语或作某种修饰、说明的成分时,就要用这种形式。
动词非谓语形式有三种:动词不定式to do,分词(现在分词doing和过去分词done)和动名词doing,动词非谓语形式仍具有动词的一般特征,可以带有宾语、状语等构成短语。
(二)动词不定式动词不定式能起名词、形容词和副词作用,充当谓语以外的各种成分。
1. 作主语:不定式可以直接放在句首做一句话的主语, it 做形式主语,to do 后置。
To learn English is not an easy thing . It is important to protect our environment .2. 作宾语:接to do作宾语的动词:want decide/determine agree would like hope wish like hate prefercontinue paln attempt promise intend afford offer fail refuse agree...He wants to visit Nanjing . Mary decided to go alone .3.作宾语补足语:1) want , would like , wish , ask , tell , expect advise allow ...sb+to doI’d like you to help me with my English exercises.2)“使役动词”:let , have , make&感官动词hear / see / notice /notice/observe / feel…+宾语+do(感官动词还可以加doing作宾语补足语)The landlord made my grandfather work in the field all day(改成被动句).I often hear her sing. & I heard her singing when I passed by room this morning.3)think consider believe find imagine...sb +(to be)+n/adj.I thought her(to be) nice and honest the first time I saw her.When she woke up, she found herself (to be)badly injured.4). Think consider find it(形式宾语)+adj+to doI find it easy to get along with him. I think it important to learn English well.4. 作表语:如:The young man seems to be a college graduate . To see is to believe . 百闻不如一见。