高中英语 Unit 2 Working the land Part Ⅲ Grammar Writing教学案 新人教版必修4-新人教版高一必修4英语教学案

Part Ⅲ Grammar & WritingGrammar——动词ing 形式作主语和宾语一、基本用法动词ing 形式在句子中可以作主语、宾语、表语、宾语补足语和状语。其基本形式如下：Being exposed to the sun for a long time will do harm to your skin.暴露在太阳下太长的时间会伤害你的皮肤。He enjoys walking in the field in a summer morning.他喜欢在夏日的早上在田间漫步。[名师点津] (1)非谓语动词ing 形式的一般式常表示该动作与句子谓语动作同时发生，而动词ing 形式的完成式则表示该动作发生在谓语动作之前。(2)非谓语动词ing 形式若与其逻辑主语之间为被动关系时，需用被动语态；而不及物动词的非谓语形式无被动语态，但可有完成形式。(3)非谓语动词ing 形式的否定式通常是在其前加 not，带有逻辑主语时 not 应放在逻辑主语和动词ing 形式之间。[即学即用]写出下列句中的动词ing(短语)所充当的成分①Playing with fire is dangerous.______________②Would you mind opening the window？______________③Having finished his paper，he handed it to his tutor.______________④When he walked past the playground ， he saw some boys playing football happily.______________单句改错⑤Excuse me for not my coming on time.______________⑥I'm sorry for having not kept my promise.______________[答案] ①主语 ②宾语 ③状语 ④宾语补足语⑤not my→my not ⑥ having not→not having1．动词ing 形式作主语(1)动词ing 形式作主语时，多表示经常性、习惯性的动作，谓语动词多用单数形式Laughing often will benefit you a lot.笑口常开好处多多。Having lived abroad for a long time makes him homesick.在国外生活了很久令他想家。[名师点津] 意义不同的两个动词ing 形式并列作主语时，谓语动词需用复数形式。Writing and reading are her two hobbies.写文章及读书是她的两个爱好。(2)形式主语 it 代替动词ing 形式作主语①It is＋adj.＋doing sth.It is/feels funny doing sth. 做某事(感觉)很滑稽It is useless doing sth. 做某事无用It's worthwhile doing sth. 做某事是值得的②It is a waste of＋n.＋doing sth.It's a waste of time doing sth. 做某事是浪费时间③It is no...