7、動(dòng)詞不定式的被動(dòng)語態(tài)用法:如果動(dòng)詞不定式的邏輯主語為這個(gè)不定式所表示的動(dòng)作的承受者時(shí),不定式一般就用被動(dòng)語態(tài)形式,如:What is to be done next hasn’t been decided yet.
練習(xí)、非謂語動(dòng)詞(一)
6、動(dòng)詞不定式的時(shí)態(tài)形式所表示的時(shí)間關(guān)系:(1)一般式:動(dòng)詞不定式一般式所表示的動(dòng)作是和謂語動(dòng)詞所表示的動(dòng)作同時(shí)發(fā)生,但在多數(shù)情況下,是在謂語動(dòng)詞所表示的動(dòng)作之后發(fā)生,如:We decided to plant more trees this spring.(其后),They often watch us play table tennis.(同時(shí));(2)完成式:動(dòng)詞不定式完成式所表示的動(dòng)作發(fā)生在謂語動(dòng)詞所表示的動(dòng)作之前,如:I am sorryto have kept you waiting.(3)進(jìn)行式:動(dòng)詞不定式進(jìn)行式所表示的動(dòng)作正在進(jìn)行中,而且與謂語動(dòng)詞所表示的動(dòng)作同時(shí)發(fā)生,如:She happened to be writing a letter in the room when I came in.
5、動(dòng)詞不定式的否定式:動(dòng)詞不定式的否定式是由not + 動(dòng)詞不定式構(gòu)成,如:It’s wrong of you not to attend the meeting.
4、疑問詞 + 動(dòng)詞不定式:疑問代詞和疑問副詞后可加動(dòng)詞不定式構(gòu)成不定式短語,在句中可作主語、表語或賓語,如:How to prevent them from swimming in this river is a problem.
3、復(fù)合結(jié)構(gòu)不定式:由for + 名詞(或代詞賓格)+ 動(dòng)詞不定式即構(gòu)成復(fù)合結(jié)構(gòu)的動(dòng)詞不定式。其中for本身無意義。for后面的名詞或代詞是不定式的邏輯主語,這種不定式在句中可作主語、表語、賓語、定語或狀語,如:It is very important for us to get everything ready for the harvest. 當(dāng)作表語用的形容詞表示不定式的邏輯主語的性質(zhì)或特征時(shí),就用介詞of而不用for引出不定式的邏輯主語,這些形容詞一般有g(shù)ood, nice, kind, wise, silly, stupid, foolish, right, wrong, careless, impolite等,如:It is very kind of you to help him every day.
2、動(dòng)詞不定式的基本用法:動(dòng)詞不定式能起名詞、形容詞和副詞的作用,可在句中作主語、表語、賓語補(bǔ)足語、定語和狀語用,如:
(1)作主語:To help each other is good.(動(dòng)詞不定式作主語時(shí),一般可用it作形式主語,而將作主語的動(dòng)詞不定式置于句末,如:It is good to help each other.
(2)作表語:My job is to drive them to the power station every day. 動(dòng)詞不定式在系動(dòng)詞be之后作表語,與表示將來時(shí)的be + 動(dòng)詞不定式結(jié)構(gòu)有所區(qū)別,如:Our plan is to set up another middle school for the peasants’ children.我們的計(jì)劃是給農(nóng)民子弟再成立一所中學(xué)。(句中的謂語動(dòng)詞為is,動(dòng)詞不定式to set up… 為表語,主語為plan,但plan并不是動(dòng)詞不定式的邏輯主語,即動(dòng)詞不定式 to set up所表示的動(dòng)作不是主語plan產(chǎn)生的。)We are to set up another middle school for the peasants’ children.我們將為農(nóng)民的子弟再成立一所中學(xué)。(句中的are to set up整個(gè)結(jié)構(gòu)為句中謂語,主語為we,同時(shí)也是動(dòng)詞不定式to set up所表示的動(dòng)作的邏輯主語,即動(dòng)詞不定式to set up所表示的動(dòng)作是由we產(chǎn)生的)。
(3)作賓語:①作及物動(dòng)詞的賓語,如:She wishes to be a musician.;②作某些形容詞的賓語:可以有動(dòng)詞不定式為賓語的形容詞一般有g(shù)lad, sorry, afraid, pleased, determined, willing, eager, anxious, ready, sure等,如:I am determined to give up smoking.;③動(dòng)詞不定式一般不作介詞的賓語,但動(dòng)詞不定式之前如有疑問詞時(shí),就可作介詞的賓語,如:Can you give us some advice on what to do next?
(4)作賓語補(bǔ)足語,如:Tell the children not to play on the street. 如果句中的謂語動(dòng)詞為see, hear, watch, notice, have, make, let等,作賓語補(bǔ)足語的動(dòng)詞不定式須將to省去,如:I saw a little girl run across the street.
(5)動(dòng)詞不定式在句中作賓語,如帶有賓語補(bǔ)足語時(shí),須先用it作形式賓語,而將該動(dòng)詞不定式后置,如:I don’t think it right to do it that way.
(6)作定語:動(dòng)詞不定式作定語時(shí),須位于被其修飾的名詞或代詞之后,如:Is this the best way to help him? 和定語用的動(dòng)詞不定式如果是不及物動(dòng)詞,不定式后面就要用必要的介詞,如:He is the man to depend on. 如果被不定式修飾的名詞為place, time, way,不定式后面的介詞,習(xí)慣上可以省去,如:The old man is looking for a quiet place to live. (7)作狀語:動(dòng)詞不定式可以作下列的狀語:①目的狀語: Every morning he gets up very early to read English. 為了強(qiáng)調(diào)不定式表示目的的作用,可在不定式前加in order to或so as to(以便或?yàn)榱?,但應(yīng)注意in order to位于句首或句中均可,而so as to不能位于句首,如:She reads China Daily every day in order to (so as to) improve her English. 將表示目的的不定式置于句首,也可強(qiáng)調(diào)目的的作用,如:To master a foreign language, one must work hard at it. ②結(jié)果狀語:They lived to see the liberation of their home town.他們活到親眼見到了他們家鄉(xiāng)的解放。③too + 形容詞或副詞 + 動(dòng)詞不定式,表示“足能…”的結(jié)果,如:You are old enough to take care of yourself now.
1、動(dòng)詞不定式的形式變化:動(dòng)詞不定式有下列時(shí)態(tài)和語態(tài)的形式變化。
語態(tài)式 |
一般式 |
完成式 |
進(jìn)行式 |
完成進(jìn)行式 |
主 動(dòng) |
to
build |
to
have built |
to
be building |
to
have been building |
被 動(dòng) |
to
be build |
to
have been build |
|
|
50. ______ I wish to see you!
A. What B. What do C. How D. How do
49. Let’s ______ time .
A. not to waste B. not waste C. waste no D. waste not
48. ______ again!
A. Coming B. Do come C. To come C. Do coming
湖北省互聯(lián)網(wǎng)違法和不良信息舉報(bào)平臺(tái) | 網(wǎng)上有害信息舉報(bào)專區(qū) | 電信詐騙舉報(bào)專區(qū) | 涉歷史虛無主義有害信息舉報(bào)專區(qū) | 涉企侵權(quán)舉報(bào)專區(qū)
違法和不良信息舉報(bào)電話:027-86699610 舉報(bào)郵箱:58377363@163.com