高中英语语法讲解不定式(7)

高中英语语法讲解不定式

－Hasn’t he finished writing the report?

难道他还没写完报告吗?

－No, but he ought to have.

是的,但他本来应该写完。

F

常见的含有动词不定式的句式主要有以下几种：

一.

It takes sb. some time （money）to do sth.

某人花费多少时间（金钱）做某事。例如：

1. It often takes me half an hour to watch TV every evening.

每天晚上我常常用半小时看电视。

2. It took me ten yuan to buy the book last week.

上周我花了10元买那本书。

3. How long will it take them to finish the work?

完成那项工作需要花费他们多少时间？

在使用该句式要注意的是：sb. 如果代词表示用宾格；take随时态改变；句中的时间用段时间，对此提问用how long。

例：It takes us more than two hours to do our homework every day.

It took us more than two hours to do our homework yesterday.

It will take us more than two hours to do our homework tomorrow.

How long did it take you to do your homework yesterday?

二. It’s time to do sth. 该做某事了，同义句为：

It’s time for sth. / doing sth. 例：

It’s time to go to school. 该上学了。

（It’s time for school.）

It’s time to get up. 该起床了。

（It’s time for getting up.）

此句可以扩展为：It’s time for sb. to do sth.

是某人做某事的时间了。

for sb. to do sth. 是动词不定式的复合结构。例：

It’s time for me to work.

到我工作的时间了。

It’s time for you to go to school.

到你们上学的时间了。

三. 主语＋be（not）+adj.+enough to do sth.

（某人、某物）足够（不能）做某事。例：

The boy is old enough to go to school.

这个孩子到了上学年龄。