第1个回答 2011-08-20
hear watch notice see feel listen to（介词，与还原的to不是一回事）这些叫感官动词
let make have（使，让）这些叫使役动词
help（主动语态中可能to本来带着的）
let make have（使，让）这些叫使役动词
help（主动语态中可能to本来带着的）
第2个回答 2011-08-23
let，make，have，hear，watch，see，feel，notice
第3个回答 2011-08-20
hear listen to watch see notice feel help
he was seen to enter the room.
She was heard to sing in the classroom.本回答被网友采纳
he was seen to enter the room.
She was heard to sing in the classroom.本回答被网友采纳
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