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　　there are so many kinds of tape-recorders on sale that i can't make up my mind which to buy.有這么多的錄音機(jī)，我都拿不定主意買哪一種。
　　注意

　　疑問詞帶不定式在句中作成分時(shí)，謂語動(dòng)詞用單數(shù)。如：the question is how to put it into practice. 問題是怎樣把它付諸實(shí)施。

2. 不定式作補(bǔ)語

　　1) 動(dòng)詞+賓語+不定式(to do)

　　advise, allow, appoint, believe, cause, challenge, command, compel, consider, declare, drive, enable, encourage, find, forbid, force, guess, hire, imagine, impel, induce, inform, instruct, invite, judge, know, like, order, permit, persuade, remind, report, request, require, select, send, state, suppose, tell, think, train, trust, understand, urge, warn

　　a. father will not allow us to play on the street.　父親不讓我們在街上玩耍。

　　b. we believe him to be guilty. 我們相信他是有罪的。

　　find 的特殊用法

　　find 后可用分詞做賓補(bǔ)，或先加形式賓語，再加形容詞，最后加帶to 的動(dòng)詞不定式。find后也可帶一個(gè)從句。此類動(dòng)詞還有g(shù)et，have。

　　i found him lying on the ground.

　　i found it important to learn.

　　i found that to learn english is important.
　　典型例題

　　the next morning she found the man ___ in bed，dead.　

　　a. lying　 b. lie　 c. lay　 d. laying　　

　　答案：a. find的賓語后面，用分詞或分詞短語，起賓語補(bǔ)足語作用。現(xiàn)在分詞表達(dá)主動(dòng)，也表達(dá)正在進(jìn)行，過去分詞表達(dá)被動(dòng)。

　　2) to + be 的不定式結(jié)構(gòu)，作補(bǔ)語的動(dòng)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), understand

　　we 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。

　　典型例題

　　charles babbage is generally considered　___ the first computer.　

　　a. to invent　b. inventing　 c. to have invented　 d. having invented　

　　答案：a. 由consider to do sth. 排除b、d。. 此句只說明發(fā)明這一個(gè)事實(shí)，不定式后用原形即可。而c為現(xiàn)在完成時(shí)，發(fā)明為點(diǎn)動(dòng)詞一般不用完成時(shí)，且此處也不強(qiáng)調(diào)對現(xiàn)在的影響，因此不選c。

　　3) to be +形容詞

　　seen, appear, be said, be supposed, be believed, be thought, be known, be reported, hope, wish, desire, want, plan, expect, mean

　　the book is believed to be uninteresting.　人們認(rèn)為這本書沒什么意思。
　　4) there be+不定式

　　believe, expect, intend, like, love, mean, prefer, want, wish, understand

　　we didn't expect there to be so many people there. 我們沒料到會有那么多人在哪里。

　　注意

　　有些動(dòng)詞需用as 短語做補(bǔ)語，如regard, think believe, take, consider.

　　we regard tom as our best teacher.　我們認(rèn)為湯姆是我們最好的老師。

　　mary took him as her father .　瑪麗把他當(dāng)作自己的父親。

1) it's easy (for me) to do that. 我做這事太容易了。

　　easy, difficult, hard, important, possible, impossible, comfortable, necessary, better;

　　the first, the next, the last, the best, too much, too little, not enough

　　it's so nice to hear your voice.　聽到你的聲音真高興。

　　it's necessary for you to lock the car when you do not use it. 當(dāng)你不用車的時(shí)候，鎖車是有必要的。

　　2) it's very kind of you to help us. 他幫助我們，他真好。

　　kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考慮周到的), silly, selfish(自私的)

　　it was silly of us to believe him.　我們真愚蠢，竟然相信了他。

　　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。

　　注意

　　1) 其他系動(dòng)詞如，look，appear等也可用于此句型

　　2) 不定式作為句子成分時(shí)，動(dòng)詞用單數(shù)形式。

　　3) 當(dāng)不定式作主語的句子中又有一個(gè)不定式作表語時(shí)，不能用it is… to…的句型

　　(對)to see is to believe.　百聞不如一見。(錯(cuò))it is to believe to see.

　　it's for sb.和 it's of sb.

　　1) for sb. 常用于表示事物的特征特點(diǎn)，表示客觀形式的形容詞，如easy, hard, difficult,　 interesting, impossible等：

　　it's very hard for him to study two languages. 對他來說學(xué)兩門外語是很難的。

　　2) of sb的句型一般用表示人物的性格，品德，表示主觀感情或態(tài)度的形容詞，如good, kind, nice, clever, foolish, right。

　　it's very nice of you to help me. 你來幫助我，你真是太好了。

　　for 與of 的辨別方法

　　用介詞后面的代詞作主語，用介詞前邊的形容詞作表語，造個(gè)句子。如果道理上通順用of，不通則用for。如：you are nice.　(通順，所以應(yīng)用of)。he is hard.　(人是困難的，不通，因此應(yīng)用for。)

4. 不定式作表語

　　不定式可放在be動(dòng)詞后面，形成表語。例如：

　　my work is to clean the room every day.

　　his dream is to be a doctor.

　　5. 不定式作定語

　　不定式做定語通常要放在被修飾的詞后。例如：

　　i have a lot of work to do.　

　　so he made some candles to give light.