Unit 5 Learning from Nature using language 导学案-2021-2022学年高中英语外研版选择性必修第三册

非谓语动词作主语、宾语和表语 一、非谓语作主语 Read the following sentences and find their subjects 1．Knowing basic first­aid techniques will help you respond quickly to emergencies. 2．It is no use complaining without taking action. 3．To climb the mountain is hard work but to go down the mountain is great fun. 4．It is not easy to find your way around the town. Look at Sentences and answer questions： 1.To protect the environment is everyone’s duty. 2. It is everyone’s duty to protect the environment. 3. Eating too much chocolate is bad for your teeth. 4. It is no use asking me. I know no more than you know. 划线部分充当的句子成分为：_______ 非谓语中可充当其成分的有：_______ 和_______。 [归纳用法] 1．­ing形式作主语表示一般的、抽象的、泛指的概念，常用it作形式主语。 常用于固定句型： It's a waste of time doing...； It's no use/good doing...； It is useless doing...； There is no doing... 2．不定式作主语，一般表示具体某一次的动作。常用 it作形式主语。 3．it作形式主语时，不定式或­ing形式是真正的主语，放在句子后部，以使句子保持平衡。 It is +adj + for sb +to do It is +adj+of sb +to do [即学即练1]　单句语法填空 ①His coming (come)late made the teacher very angry