动词let, have, make, notice, watch, observe, feel, hear, see, 后用动词原形作宾补. 如改为被动语态.省掉的to要还原. e.g. I heard Mary sing last night. Mary was heard to sing last night. 查看更多

 

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动词不定式可以充当________以外的所有成份;不定式作主语或宾语时,常用________形式主语或形式宾语;在see, hear, watch, feel, notice, observe, make, let, have, listen to, look at等词后的补足语中,不定式不带to,但是这些句子如果变成被动结构,就必须带________;动词不定式在介词________,________,________后面时,如果这些介词之前有行为动词do的各种形式,那么,这些介词后的不定式不带to,否则要带to。

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