不定式作表语的语法应用一、动词不定式的结构
to+动词原形
二、动词不定式作表语
1、表示目的。
例句:
The next step is to make sure that you know exactly what is required. 下一步你要真正弄清楚需要的是什么。
The purpose of education is to develop a fine personality in children. 教育的目的是发展儿童遥的品格。
2、表示事态发展的结果、预期的结果、不幸的命运或语言。
例句:
He was to perish in a shipwreck and to l-eave a wife and two children. 后来他在遥船只失事中死了,留下了妻子和两个孩子。
You must speak out,if we are to remain friends. 如果我们还想继续做朋友的话,你就必须痛痛快快地把话都说出来。
You are to die at ninety-eight. 你会在98岁时去世。
3、用于遥称疑问句,表示征求意见。
例句:
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? 如果没有遥,我该怎么办呢?
4、用于被动语态,相当于can/could,should,ought to,must,具有情态意义。
例句:
You are to be rewarded. 你应该受到奖励。 (should)
It’s nowhere to be found. 哪儿也找不到它。 (can’t be)
These books are not to be sold. 这些书不应该卖掉。 (ought not to be)
5、表示同意、安排、命令、决定、劝告、意愿、禁止等。
例句:
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. 想要遥,就必须有耐心,有毅力。 (愿望)
6、不定式作表语,可用主动形式表示被动意义。
例句:
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。