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课件网) UNIT 3 FASCINATING PARKS Learning About Language 动词-ing形式作主语 动名词作主语 夏天游泳是很有趣的。 是 主语 ——— ◆Swimming is fun in summer. 游泳 对于老人来说爬山确实困难。 ◆Climbing mountains is really difficult for the old. 爬山 1、动词或动词短语作句子主语时应该使用动名词（v-ing)或者不定式(to do)的形式 is is ，谓语动词通常是单数。 2、动名词（短语）作主语时，通常置于句首，可以有自己的宾语、逻辑主语等。 ◆Reading such a wonderful novel is worthwhile . ◆Mike’s returning to work is a great help to us. 迈克回来工作对我们来说是一大帮助。 这么好的小说很值得一读。 [即时演练1]———单句语法填空 (1) _____(learn) a musical instrument introduces a child to an understanding of music. (2)Be careful！_____(play) with fire near the wood will be very dangerous. (3) _____(punish) made the student lose interest in his studies. (4)In my opinion, swimming ____(be) a good sport in summer. Learning Playing Being punished is ◆Reading such a wonderful novel is worthwhile . 这么好的小说很值得一读。 ◆It is worthwhile reading such a wonderful novel. 2．形式主语it可代替动名词作主语。此类句式常见的有： It's a waste of time doing sth. 做某事是浪费时间。 It's worthwhile doing sth. 做某事是值得的。 It's no good/use/fun doing sth. 做某事不好/没用/没意思。 [即时演练2]———单句语法填空 (1)It is a waste of time _____(try) to persuade him to give up playing computer games. (2)It's no use _____(complain) without taking action. trying complaining 3．当句型“There is no...”表示“不允许、禁止某种行为的发生或存在”时，需用动名词作主语。 ◆There is no denying that the environment has improved a lot. 不能否认环境状况已经得到很大改善。 ◆There is no joking about such matters. 这种事开不得玩笑。 [即时演练3]———完成句子 (1)不能说出他要做什么。 _____ what he is going to do. (2)这么严肃的事，不能和他开玩笑。 _____ about such a serious issue. There is no telling There is no joking with him 动名词和不定式作主语的含义 骑单车能使一个人敏捷。 完成这项计划需要很大的努力。 Riding a bike can make a man smart. To complete the program needs much effort. （表示一般的、泛指的或习惯性的行为） （表示具体的、一次性的或将来的动作） 表示一般的、泛指的或习惯性的行为用动名词；表示具体的一次性的或将来的动作用不定式。 It is both challenging and rewarding to study abroad.→ It would hardly be possible to go on a hiking tour in Sarek in winter due to the extreme cold. → Going on a hiking tour in Sarek in winter would hardly be possible due to the extreme cold. Studying abroad is both challenging and rewarding. Activity 3: Rewrite the sentences using the –ing form. Page 29, Activity 2 Honestly, it can be both exciting and terrifying to explore a vast unknown land. → It is good to adopt a positive attitude, even when things are difficult. → Honestly, exploring a vast unknown land can be both exciting and terrifying. Adopting a positive attitude is good, even when things are difficult. Page 29, Activity 2 Activity 3: Rewrite the sentence ... ...
