手机短信验证
01
不定式做主语
例如：
To be a doctor is hard. 做医生很难。
To learn English well is not easy.学好英语不容易。
1）单个不定式作主语时,谓语动词用单数
2）动词不定式（短语）作主语时，为了避免句子的头重脚轻，可以用“it”作形式主语，而把真正的主语则为动词不定式（短语）放在句子的后部。例如上面的句子可以表示为：
To learn English well is not easy.= It is not easy to learn English well.
To use English every day is important for students. = It is important for students to use English every day.
语法易错题
英语单词快速记忆
初中英语试题
02
不定式作宾语 ( vt. + to do )
动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin, start, want, forget, remember, learn, like, hate, love, ask , decide, expect, want, hope, wish, offer, fail, plan, learn, pretend, refuse, manage, help, agree, promise, prefer, mean 等等
例如：
1）I want to tell you a story. 我想给你讲个故事。
2）They begin to work at eight every morning. 他们每天早晨8点开始工作。
3）Don’t forget to lock the door. 别忘了锁门。
4）Would you like to go and have a picnic with us tomorrow? 明天和我们一起去野餐好吗？
【注意】
㊙如果and连接两个动词不定式，第二个动词不定式一般省“to” 如：He wants to go and have a swim with us. 他想和我们一起去游泳。
㊙若作宾语的动词不定式（短语）很长，可用it作形式宾语，如：
I find it interesting to learn English with you.
我觉得和你一起学英语很有趣。
He found it hard to catch up with others.
他觉得赶上别人很困难。
03
不定式做表语
1）不定式表示目的
The purpose of education is to develop a fine personality in children.
教育的目的是发展儿童完美的品格。
2）表示事态发展的结果、预期的结果、不幸的命运
He was to perish in a shipwreck and to leave a wife and two children.
后来他在一次船只失事中死了，留下了妻子和两个孩子。
You are to die at ninety-eight.
你会在98岁时去世。
3）用于第一人称疑问句，表示征求意见
What am I to say if they ask me the question?
要是他们问我这个问题，我该怎么回答呢？
What am I to do if I have no money?
如果没有钱，我该怎么办呢？
4）表示“同意、安排、命令、决定、劝告、意愿、禁止”等
They are to marry next week.
他们将在下周结婚。（安排）
Children are not to smoke.
儿童不准吸烟。（禁止）
You must be patient and persistent if you are to succeed.
想要成功，就必须有耐心，有毅力。（愿望）
5）不定式作表语，可用主动形式表示被动意义
She is to blame.
她应该受到责备。
A great deal is yet to do.
还有许多事要做。
Something is still to find out.
有些东西还有待查明。
