为什么这里不要还原to?I heard the boy singing just now.The boy was heard si_英语解答

为什么这里不要还原to?I heard the boy singing just now.The boy was heard singing just now.

人气：367 ℃　时间：2020-05-09 10:31:16

解答

hear +宾语 +宾补[ do/doing/v+ed ]
hear +宾语 +do宾补此结构中是省略了to的不定式.当变成被动时才要还原to