1、不定式作表语观察例句1Perhaps the best way to understand Western art is to look at the development of Western painting over the centuries.2During the Middle Ages，the purpose of Western art was to teach people about Christianity.3In this work，Monets aim was to convey the light and movement in the scene.4What th
2、ey attempted to do was no longer show reality，but instead to ask the question，“What is art？”归纳用法一、不定式作表语的用法1表示主语的内容。The purpose of education is to develop a fine personality in children.教育的目的是培养儿童健康的人格。2表示事态发展预期的结果、不幸的命运等。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。3
3、用于第一人称问句，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？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)即学即练1单句语法填空His ambition is to become (become) a famous novelist.Our most important task now is to make (make) a plan.The function of Louis Sullivans arc
4、hitecture was to provide(provide) large uninterrupted floor areas and to allow ample light into the interior.二、不定式和现在分词作表语的区别1动词不定式作表语，通常表示具体的或将来的动作。Our first assignment was to read two short stories.我们的首要任务是读两篇短篇故事。2现在分词作表语，表示抽象的一般行为。My work is teaching Chinese.我的工作是教语文。即学即练2单句语法填空The most importan
5、t thing is to negotiate (negotiate) with them about the future of the plant.What we expect from you is working(work) hard rather than hardly working.三、不定式作表语to的省略1当主语thing这个词被动词不定式修饰时，作表语的不定式符号“to”可以省略。The thing for us to do is accept the challenge.我们要做的事情就是要接受挑战。2当主语是带有动词“do”的由“what”引导的主语从句时，其表语的动词
6、不定式符号“to”可以省略。What they want to do is have a good sleep.他们想要做的就是好好睡一觉。3当句子主语是被动词“do”作谓语的定语从句修饰的anything，all，all that，the only thing，the only way，或者主语thing前面有序数词first，second，last等修饰时，其表语动词不定式的符号“to”可以省略。The only thing you have to do is press the button.你要做的唯一的事情就是按一下按钮。.单句语法填空1My work is to clean(cle
7、an) the rooms every day.2To do two things at a time is to do(do) neither.3The next step is to make(make) sure that you know exactly what is required.4You must be patient and persistent if you are to succeed(succeed)5What am I to do(do) if I have no money?.短文语法填空I am a manager of a small company. My
8、job is 1.to manage(manage) the daily work of the company. One day，I was 2.to leave(leave) the company when I found a little boy was 3.to slip(slip) into the building of the company. I stopped him and asked what he was 4.to do(do). He explained that he was 5.to see(see) the process of how our products were worked 6.out. I told him it was too late 7.to do(do) that and he could come earlier the next day and I would show him 8.around our company in person. The boy waved goodbye 9.to me and left happily. I thought all he had to do was 10.study(study) hard at school.
