Unit 2 Working the land Period 3精品课件 人教版高中必修4.pptVIP

Sentences with –ing forms as subject or object. 一、–ing 作主语或宾语 1．作主语 ①直接置于句首 1) 捉弄别人是我们万万不能干的. Playing tricks on others is something we should never do． 2)学习新单词对我来说非常重要。 Learning new words is very important for me． 3)说比做容易。 Talking is easier than doing. 注意: allow/ permit /advise sb to do allow/ permit /advise doing 注意: need/ require/want(需要)doing = need/ require/want to be done 窗户需要清洗。 The window needs／requires／wants cleaning／ to be cleaned． 注意：-ing form的否定形式 not + v-ing Summary -ing 作主语 * * 1.Since then, finding ways to grow more rice has been his life goal. (subject) 2.As a young man, he saw the great need for increasing the rice output. (object of preposition) 3. Dr Yuan searched for a way to increase rice harvests without expanding the area of the fields. (object of preposition ) 4. However, he doesn’t care about being famous. (object of preposition ) 5. He enjoys listening to violin music,playing mah-jong, swimming and reading. (object of verb) 6. Spending money on himself or leading a comfortable life also means very little to him. (subject) 7. Just dreaming for things, however, costs nothing. (subject) 8. Dr Yuan awoke from his dream with the hope of producing a kind of rice that could feed more people. (object of preposition) ②用形式主语it，把真正的主语ing形式移置句尾。但这种句子形式有一定的限制，作表语的只能是某些形容词或少数名词。 和夏洛克争辩是没有什么用的。 It is useless trying to argue with Shylock． 这事值得去做。 It’s worth making the effort． 想再解释一次有好处吗? Is it any good trying to explain? 跟你在一起工作是令人愉快的。 It is pleasant working with you． ③在there be no结构中作主语 这种结构的意思相当于“It is impossible to do… ”。 无法知道他什么时候离开 There was no knowing when he would leave. 这种事开不得玩笑。 There is no joking about such matter. 注意：-ing与to do的比较： -ing表示的动作通常是一个泛指的动作，不定式则通常表示具体的动作。 我喜欢看书，但是我现在想看电影。 I like ，but now I like . reading to see a film 归纳：常用-ing形式作主语的句型有： It +be