pretend to do sth是固定的结构
sleep是动词,即充当do.意为假装睡觉
而asleep是形容词,通常用作fall aleep意为“入睡”,也常与be动词连用,表示睡着的状态,所以be充当do,asleep在be后充当表语（be动词后面的词成为表语）.意为假装睡着
在英语中经常有be动词与形容词连用,请注意
pretend to do sth.是假装做某事的意思,
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相关问题
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… pretend to do sth … pretend to be doing sth … pretend to h
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错过做某事 miss doing sth还是miss to do sth.
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for doing sth 和in order to do sth是不是都有为了做某事的意思?
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偏爱做某事是be partial to doing sth.