1、高考资源网（） 您身边的高考专家不定式作主语和表语观察例句观察黑体部分在句中的语法作用1To get there by bike will take us half an hour.作主语2Her job is to take care of the children in the kindergarten.作表语3To do this is to cut the foot to fit the shoe.作主语4To have known you is a privilege.作主语5The purpose of education is to develop a fine personal
2、ity in children.作表语归纳用法一、不定式作主语1动词不定式作主语时，谓语动词常常用单数。例如： To do morning exercises is useful for our health.做早操有利于我们的健康。 To sweep the floor is my duty every day.每天扫地是我的责任。2如果动词不定式太长，常常用it作形式主语，而将真正的主语动词不定式后置。例如： It took me half an hour to walk there.我走到那儿花了半小时的时间。Its important for us to learn English w
3、ell.对我们来说，学好英语是重要的。即学即练1单句语法填空It is difficult for us to finish(finish) writing the composition in a quarter of an hour.To finish(finish) this job in one day is impossible.二、不定式作表语1表示目的。The next step is to make sure that you know exactly what is required.下一步你要弄清楚真正需要的是什么。2表示事态发展的结果、预期的结果、不幸的命运或预言。He
4、was to perish in a shipwreck and to leave his 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。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用于被动语态，相当于can/could，should，ought to，must，具有情态意义。You are to be rewarded.你应该受到
5、奖励。(should)Its nowhere to be found.哪儿也找不到它。(cant be)5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)6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。即学即练2单句语法填空You must speak out，if we are to remain(remain) friend
6、s.You must be patient and persistent if you are to succeed (succeed)You are to die(die) at ninetyeight.单句语法填空1To do(do) two things at a time is to do neither.2What I would suggest is to start(start) work at once.3His wish is to buy(buy) a luxurious car in the near future.4It is stupid of you to writ
7、e(write) down everything that the teacher says.5Its a good habit to read(read) books every day.短文语法填空I have a lot of hobbies 1.when I studied in college.It was hard for me 2.to save(save) money to keep my hobbies.It was foolish of me 3.to spend(spend) plenty of time with those.But my first task at t
8、hat time was 4.to study(study) hard.I often got up early 5.to catch(catch) up with other students.It took me two terms 6.to make(make) up for my lost time.My wish was 7.to become(become) a surgeon，but it was not easy.I think 8.to make(make) the same mistakes is not wise.I should take hold of the good chance and spare no effort 9.to achieve(achieve) my goal.Now，Im a doctor，10.and I will never forget the experience in that time.- 3 - 版权所有高考资源网