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不定式到底用主動(dòng)形式還是被動(dòng)形式，往往取決于句子的意思，即意思上為主動(dòng)就用主動(dòng)形式，意思上為被動(dòng)就用被動(dòng)形式：
Did it need to be done so soon? 這事需要這么快就做嗎?
She can’t bear to be laughed at. 她受不了被人嘲笑。
There was business to be taken care of. 有生意要人管理。
It remains to be seen whether you are right. 你是否正確，以后見(jiàn)分曉。
There was a lot of rubbish to be got rid of. 有大量垃圾需要扔掉。
不定式的完成被動(dòng)式表示發(fā)生在謂語(yǔ)動(dòng)作之前的被動(dòng)動(dòng)作：
I’m pleased to have been given this opportunity. 給了我這次機(jī)會(huì)我很高興。
It’s said to have been built in the Ming dynasty. 據(jù)說(shuō)它是明朝修建的。
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