If you don't want to do it, you don't need to.
(9)不定式的并列:第二个不定式可省略to。
He wished to study medicine and become a doctor.
(二)V-ing 形式
1.形式
(1)一般式:doing
Seeing is believing. 眼见为实。
(2)被动式: being done
He came to the party without being invited.他未被邀请就来到了晚会。
(3)完成式: having done
We remembered having seen the film. 我们记得看过这部电影。
(4)完成被动式: having been done
He forgot having been taken to Guangzhou when he was five years old.
他忘记五岁时曾被带到广州去过。
(5)否定式:not +doing
I regret not following his advice. 我后悔没听他的劝告。
(6)复合结构:形容词性物主代词(或名词所有格)+doing
He suggested our trying it once again. 他建议我们再试一次。
His not knowing English troubled him a lot. 他不懂英语给他带来许多麻烦。
2.句法功能
(1)作主语:
Reading aloud is very helpful. 朗读是很有好处的。
当动名词短语作主语时常用it作形式主语。
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