1、Section Discovering Useful Structures动词-ing形式作主语1.动词-ing形式作主语【观察思考】Sailing a boat is great fun,but to sail a boat today is not fun because of the strong wind.Learning to think critically is an important skill todays children will need for the future.Painting and collecting stamps are his hobbies.Bei
2、ng educated in Peking University is her dream.It is no use learning without practice.【探究总结】(1)动词-ing形式和不定式都可以用作_。动词-ing形式往往表示普通的、一般的行为,而不定式常表示某次具体的行为。(2)动词-ing形式作主语时,根据主谓一致的原则,谓语动词使用_形式。但是意义不同的两个动词-ing形式并列作主语时,谓语动词要用_形式。(3)如果作主语的动词表示被动意义,那么使用being done作主语。(4)动词-ing的否定形式是在其前面直接加上not。(5)形式主语it代替动词-ing
3、形式作主语的常见句型:It is a waste of+time/money+doing sth.做某事是浪费时间/金钱。It is no+use/good/fun+doing sth.做某事没有用/没有好处/不好玩。It is useless/worthwhile.+doing sth.做某事是没有用的/值得的答案:(1)主语(2)第三人称单数;复数【应用实践】(1)单句语法填空。_(travel)along the old Silk Road is an interesting and rewarding experience._(kill)by a shark was what used
4、 to happen in those days.Keeping a diary in English _(help)her a lot in learning English.Not _(be)tall is not his disadvantage.答案:TravellingBeing killedhelps being(2)完成句子。It is useless _ _(和争论)him because he is stubborn.It is a waste of time _ _(玩游戏)on the computers.Its no good _ _ _(吃太多)every eveni
5、ng.答案:arguing withplaying gameseating too much2.动词-ing形式的复合结构作主语【观察思考】Their failing in the examination made them all disappointed.Kates leaving made everyone sad.【探究总结】动词-ing形式的复合结构作主语时有两种形式:形容词性+动词-ing形式;+动词-ing形式。答案:物主代词 名词所有格【应用实践】(1)完成句子。(他的到来)made us very happy.(2)句型转换。Alice was ill,which made her mother worried a lot._答案:(1)His coming(2)Alices being ill made her mother worried a lot.
