UC知道He is often heard singing in the next room.
来源：百度知道 编辑：UC知道 时间：2024/06/15 12:39:39
为什么heard后要用是singing而不用to sing
hear doing固定的
是主动啊~~他 唱歌~是主谓关系所以是用ing形式啊 ~
如果是He is to sing就是将来时 了，他 要唱歌了 。
楼上内纯属误导．．．
hear sb doing 表示过程.正在做
hear sb do 表示全过程
没有to sing ．．．．
妹子你搞错了，这里应该用to sing
to sing是宾语补足语，被动语态中的不定式不省略to 即使前面有感官动词。
表示正在做，强调这一过程
He is often heard ----in the room.
He late for school. A. is often B.often is C. does often
he has often talked about how interesting it is.
HE HEARD A NOISE
He often ___a blue coat .Look! He is __ a black one.
he often comes to office early and he is ___late for school
选择题：In the music world, he is making < > heard in China.
the man often drives the monkeys away while he is fishes
When we say a person is well in his___,we often say he's very____.
It is often said that ________ man differs from ________ animals in that he can think and speak .