【正文】 ，其含義一是條件，一是結(jié)果（例①）。例如：They ought to e )：（2）使役動詞let,have,make：（3）感官動詞see,watch,look at,notice,observe,hear,listen to,smell,feel,find 等后作賓補，省略to。s for It39。It39?！?已做)The light in the office is stil on. He forgot to turn it ，他忘記關(guān)了。try doing　試驗，試著做某事。m interested in working in Switzerland. Do you have any idea about that我對在瑞士工作感興趣。t youOK,I39。It’s said to have been built in the Ming dynasty. 據(jù)說它是明朝修建的。)We intend to go skiing this weekend. (我們打算這個周末去滑雪。He pretended to have been studying. 相當(dāng)于：He pretended that he had been studying.他假裝一直在學(xué)習(xí)的樣子。There was business to be taken care of. 有生意要人管理。t enough time.②Would you like to e to a partyI39。.be interested doing/to dointerested to do　對做某事感興趣，想了解某事。cease doing　短時停止做某事，以后還會接著做。①forget,remember,regret后接不定式，表示現(xiàn)在或未來的動作，接動名詞表示動作已經(jīng)發(fā)生。m afraid the box is too heavy for you to carry it,but thank you all the same.　不用了。Tom kept quiet about the accident so as not to lose his 。(3)與被修飾詞之間有動賓關(guān)系，同時與句中其它詞之間又有邏輯上的主謂關(guān)系時，盡管有被動含義，卻仍 用主動語態(tài)（例③）；如只有動賓關(guān)系，而無邏輯上的主謂關(guān)系，則需用被動語態(tài)（例②）。后可用分詞做賓補，或先加形式賓語，再加形容詞，最后加帶to 的動詞不定式。The question is how to put it into practice.問題是怎樣把它付諸實施。It39。如：①It+be+名詞+to doIt39。如：There are still many things to take care of (to be taken care of).但有時兩種形式表達(dá)的意思不同，如：There is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.)形式1) 現(xiàn)在式：一般現(xiàn)在時表示的動詞，有時與謂語動詞表示的動作同時發(fā)生，有時發(fā)生在謂語動詞的動作之后。m sorry to have given you so much trouble.He seems to have caught a cold.3)進(jìn)行式：表示動作正在進(jìn)行，與謂語動詞表示的動作同時發(fā)生。④It seems(appears)+形容詞+to doIt seemed impossible to save money.在句型③中，常用表示客觀情況的形容詞，如：difficult,easy,hard,important,impossible,necessary 等；在句型④中，常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示贊揚或批評的詞。It seemed selfish of him not to give them anything.　他不給他們?nèi)魏螙|西，這顯得太自私了。常見動詞：Acknowledge,　believe,　consider,　think,　declare(聲稱),　discover, fancy(設(shè)想),　feel,　find,　guess,　judge,　imagine,　know,　prove,　see(理解), show,　suppose,　take(以為),　understandWe consider Tom to be one of the best students in our class.我們認(rèn)為湯姆是班上最好的學(xué)生之一。當(dāng)主語是aim,duty,hope,idea,mista ke,plan,purpose,suggestion等為中心詞的名詞詞組（例②）時，或以what引導(dǎo)的名詞性分句（例③），不定 式說明主語的內(nèi)容。注意：在被動語態(tài)中則to 不能省掉。s of sb.（1）for sb. 常用于表示事物的特征特點，表示客觀形式的形容詞，如easy,hard,difficult,　interesting,impossible等：It39。s never too late to mend.　(諺語)改過不嫌晚。(沒有做關(guān)燈的動作)He forgot turning the light 。You must try to be more 。你想過這事嗎?　(一種想法)mean doing/to domean to do　打算、想mean doing　意味著I mean to go,but my father would not allow me ，但是我父親不肯讓我去。ll try.另外，be going to,ought to,used to等也常用于這一結(jié)構(gòu)中。完成式表示發(fā)生在謂語動作之前的動作He seems to have caught a cold. 他似乎感冒了。)I swear to honour you. (我發(fā)誓為你增光。用法只要用于助動詞之后和appear，seem之后，但也可以用在happen，pretend以及believe，know，report，say，understand的被動式之后：He appears to have been waiting a long ：It appears that he has been waiting a long time.看來他已經(jīng)等了很久了。被動式不定式被動式的用法不定式到底用主動形式還是被動形式，往往取決于句子的意思，即意思上為主動就用主動形式，意思上為被動就用被動形式：Did it need to be done so soon? 這事需要這么快就做嗎?She can’t bear to be laughed at. 她受不了被人嘲笑。s birthday party.(不定式作主語)It was impossible for lost time to be made up.(不定式作主語)I wish to be sent to work in the country.(不定式作賓語)Can you tell me which is the car to be repaired (不定式作定語)He went to the hospital to be examined.(不定式作狀語)在There be結(jié)構(gòu)中，修飾主語的不定式可用被動，也可用主動，如：There are still many things to take care of (to be taken care of).但有時兩種形式表達(dá)的意思不同，如：These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.)⒊動名詞的時態(tài)，語態(tài)(1)時態(tài)①一般式：動名詞的一般式所表示的動作可以是泛指，也可與謂語動詞同時發(fā)生，或發(fā)生在謂語動作之前或之后，如：We are interested in collecting stamps.I shall never forget seeing the Great Wall for the first time.We are not afraid of dying.②完成式所表示的動作發(fā)生在謂語動詞之前，如：Imagine having travelled on the moon.We were praised for having finished the work ahead of time.(2)被動語態(tài)①如果動名詞的邏輯主語為動名詞所表示的動作的承受者，動名詞要用被動語態(tài)，動名詞的被動語態(tài)有一般式與完成式之分，如：The young man came in without being noticed.He prided himself on having never been beaten in class