Unit 3 Fascinating ParksSection Ⅱ Learning About Language动名词作主语动名词是非谓语动词的一种，起名词的作用，动名词还保留动词的属性，可以带有自己的宾语、状语等。动名词常在句中作主语。 考点一 动名词作主语 1．动名词作主语时多表示经常性、习惯性的动作，谓语动词用单数形式。Collecting information about children's health is his job.收集有关儿童健康的信息是他的工作。易混辨析动名词/不定式作主语动名词动名词作主语表示经常性、习惯性的动作。Lying is wrong.撒谎不对。不定式不定式作主语既可表示经常性、习惯性的动作，又可表示具体的、一次性的动作。To lie to her is wrong.对她撒谎不对。2.形式主语 it 代替动名词作主语。此类句式有：It is a waste of time trying to persuade him to give up smoking.想说服他戒烟完全是浪费时间。It is worthwhile reading such a wonderful novel.读这样一本精彩的小说很值得。It is no use arguing with him about such a matter.为这种事情和他争论没有用。 考点二 动名词的复合结构 1．动名词的复合结构作主语。形式通常有两种：Their coming to help was a great encouragement to us.他们前来帮忙对我们来说是巨大的鼓舞。2．动名词的复合结构作宾语。形式有：He left the city without our knowing it.他离开这个城市我们大家都不知道。单句语法填空1．Knowing(know) basic firstaid techniques will help you respond quickly to emergencies.2．It's no use complaining(complain) without talking action.3．Being_left(leave) in charge of the shopping center has upset him.4 ． Tom's being_admitted(admit) into a famous university, as we had expected, made his parents happy.5．Being_injured(injure) in the leg made it impossible for me to walk as fast as usual.6．Walking(walk) is a good form of exercise for the young and the old.7．It's no use looking(look) forward to hearing from her soon.8．—What do you think made Mary so upset?—Losing(lose) her new bicycle.
