动词不定式专项练习一、不定式作主1. It's our duty _________ the room every day.A. to cleanB. cleanedC. cleanD. cleans( 甘省 )2. It's hard for us _________ English well.A. learnB. learnsC. to learnD. learning( 江西省 )3.建筑座立交将花工人一年多的。
It will _________ the workers over a year _________ _________ the flyover.( 北京市海淀区 )4. It's very nice _________ you to get me two tickets _________ the World Cup.A. for ， ofB. of ， forC. to ， forD. of ， to( 安徽省 )Keys ： 1. A 2. C 3. take， to， build 4. B［析］不定式作主，能够直接放在前方的主地点，也能够用先行it 作形式主，而将真实的主(不定式 )置于后边。
常的句式有：(1)It is + 形容 (of sb)to do sth.(2)It is + 名 (for sb)to do sth(3)It takes sb some time to do sth(4)It is + 形容 (for sb)to do sth. 句式(1) 中常用 nice， kind ， clever， good， right ， wrong ， foolish ， careless 等形容，与介 of 搭配，些形容常表述不定式主的属性或性；句式 (4)中常用 hard，difficult ，easy， important 等形容，与介 for 搭配，表示不定式表示的作、行的性。
注意：当不定式作主的句子中又有一个不定式作表，不可以用It is ⋯ to 的⋯句型( )To see is to believe. 百不如一。
( )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色特色，表示客形式的形容，如easy, hard, difficult, interesting, impossible 等：It's very hard for him to study two languages. 他来学两外是很的。
2) of sb 的句型一般用表示人物的性格，道德，表示主感情或度的形容，如 good, kind, nice, clever, foolish, right 。
It's very nice of you to help me. 你来帮助我，你真是太好了。
for 与 of 的辨方法：用介后边的代作主，用介前的形容作表，造个句子。
假如道理上通用of，不通用for 。
如： You are nice. (通，所以用of)。
He is hard.(人是困的，不通，所以用for。
)A.It is right to stop killing wild animals.B.It is the best time to visit USA in summer.C.It is helpful for us to learn English well.二、不定式作1. He wants ______ some vegetables.A. buyB. buyingC. to buyD. buys ( 山西省 )2. Don't forget ______ your homework with you when you come to school.A. to bringB. bringingC. to takeD. taking ( 福建省 )3. He found it very difficult ______.A. sleepingB. sleepsC. sleptD. to fall asleep ( 湖南省 )Keys ： 1. C 2. A 3. D［析］在want， like， agree， hope， wish ， learn， begin， start， seem， decide，hate， choose， forget ， remember 等后边，能够接不定式作。
假如后来接形容足，能够用it 作形式，而把作真实的不定式放到后边Sb + V + it（形式）+ agj （形容） +to+ V （）注意无BE 。
三、不定式作足1. Robert often asks us ______ his Chinese, so his Chinese is much better than before.A. help himB. to help him withC. to help withD. helps him with (江省)2.Mr Li often teaches his Japanese friends ______ Chinese food.A. cookB. cooksC. to cookD. cooked ( 甘省 )Key： 1. B 2. C［析］不定式能够用作足。
后边能够接不定式作足的有： ask， teach，expect， tell， allow 等。
四、不定式作状1. She went ______ her teacher.A. to seeB. looksC. sawD. seeing ( 江西省 )2.Meimei likes English very much. She does her best ______ English well.A. learnB. learningC. to learnD. learns ( 四川省 )Key： 1. A 2. C［析］ go， come， try ， do / try one's best 等或短作，后来经常能够接不定式作目的状。
3. I'm sorry ______ that.A. hearsB. hearingC. hearD. to hear ( 河北省 )4. I'm sorry ______ you.A. troubleB. to troubleC. troublingD. troubled (吉林省)5.My mother was very glad ______ her old friend.A. to meetB. meetC. metD. meets ( 甘省 )Keys ： 3. D 4. B 5. A［析］＂ be +形容 + to do sth ＂构中的不定式作状，常表示原由或方式。
6. The panda is so large that it can't go through the hole.( 改意思同样的句子)The hole ______ ______ ______ ______ such a large panda to go through. (广省 )7. The ice on the lake was so thin that people couldn't skate on it. ( 改意思同样的句子)The ice on the lake wasn't ______ enough ______ people ______ ______ ______. ( 广省 )Keys ： 6. is， too， small ， for 7. thick ， for ， to， skate， on［析］在上述＂too + 形容 /副 (for sb)to do ＂⋯( 太⋯⋯而不可以⋯⋯)和＂ enough (for sb) to do ⋯＂ (足以、足⋯⋯做⋯⋯) 构中，不定式作果状。
so\such......... that ........这样 ...... 致使......的用法及与其他句型的互 .A.Sb\Sth +be\ V+ so + adj\adv (a\an+adj +n)+that + can't\couldn't.........= Sb\Sth +be\ V+ too+adj\adv(for+Sb\Sth)+to+V ...... ..... 这样......致使 .... =太而.....不可以 .....B、 .so that to =in order to+V \that+从句 ...... 了以便于 ......C、 .Sb\Sth +be+ so + adj 形容＋ a \an \+n \V +adv 副 (so +little\many\much.... such +a\an+adj +n 名形容 +名 )+that + can\ould=.Sb\Sth +be\ V+adj\adv +enough 足的 + to+V ..... 这样 ..... 致使于 .....=...... 足 ....... 干 .......... 如：他太年了而不可以去上学。
A. He is too young to go to school.B. He is so young that he can to’schooltgoC． He is n ’ t old enoughto go to school.D. He is so a young boy that he can go to’schoolt（） 1、 The water is ____ dirty _____ the animals can ’t drink it.A. too . toB.so. thatC. such ,thatD. n ’答t,enough案是A to（）2、The computer cost ____much money _____ I can ’t afford to buy答it.案(选项同1)答案：B。
因 money 前有 much 所以不可以用such3．环境的污染这样严重，一些濒危动物没法生计下去。
Environment _____ _____ _____ for endrangered animals to live on.五、动词不定式作定语1. Would you like something ______?A. drinkB. drinkingC. to drinkD. drinks ( 湖北省 )2. I have a lot of homework ______.A. doB. doingC. didD. to do ( 河南省 )3. He is not an easy man ______.A. get onB. to get onC. get on withD. to get on with (山东省)Key： 1. C 2. D 3. D［简析］不定式作定语时，常放在被修饰的词语以后，与被修饰的词语为逻辑上的主谓关系或动宾关系；假如不定式的动词是不及物动词，后来要加上必需的介词或副词，组成的短语动词相当于及物动词。