人教八年级英语专项训练（5）：动词不定式分类例题解析附训练.zip

八年级英语专项训练（5）：动词不定式分类例题解析附训练
动词不定式专项练****一、动词不定式作主语
1. It's our duty _________ the room every day.
A. to clean B. cleaned C. clean D. cleans(甘肃省)
2. It's hard for us _________ English well.
A. learn B. learns C. to learn D. learning(江西省)
3.建造这座立交桥将花费工人们一年多的时间。
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， of B. of， for C. to， for D. of， to(安徽省)
Keys：1. A 2. C 3. take， to， build 4. B
［简析］动词不定式作主语时，可以直接放在谓语动词前面的主语位置，也可以用先行词it作形式主语，而将真正的主语(不定式)置于后面。常见的句式有：
(1)It is +形容词(of sb)to do sth.
(2)It is +名词(for sb)to do sth
(3)It takes sb some time to do sth
(4)It is +形容词(for sb)to do sth.句式
(1)中常用nice， kind， clever， good， right， wrong， foolish， careless等形容词，与介词of搭配，这些形容词常表述不定式逻辑主语的属性或性质；句式(4)中常用hard， difficult， easy， important等形容词，与介词for搭配，表示不定式表示的动作、行为的性质。
注意： 当不定式作主语的句子中又有一个不定式作表语时，不能用It is… to…的句型
(对)To see is to believe.　百闻不如一见。
(错)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点，表示客观形式的形容词，如easy, hard, difficult,　 interesting, impossible等：
It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2) of sb的句型一般用表示人物的性格，品德，表示主观感情或态度的形容词，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 的辨别方法：用介词后面的代词作主语，用介词前边的形容词作表语，造个句子。如果道理上通顺用of，不通则用for。如：You are nice.　(通顺，所以应用of)。He is hard.　(人是困难的，不通，因此应用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、动词不定式作宾语
1. He wants ______ some vegetables.
A. buy B. buying C. to buy D. buys (山西省)
2. Don't forget ______ your homework with you when you come to school.
A. to bring B. bringing C. to take D. taking (福建省)
3. He found it very difficult ______.
A. sleeping B. sleepsC. slept D. to fall asleep (湖南省)
Keys：1. C 2. A 3. D
［简析］在want， like， agree， hope， wish， learn， begin， start， seem， decide， hate，