I heard him sing.

结构︰

主语＋hear／see／feel＋受词＋原形不定词

说明︰

此句型意为“听／看／感觉…”。英文中表示“看”，“听”，“感觉”的三类<动词>，加了<受词>之后，须接原形<动词>做<受词补语>，用以表示已发生，而且是主动意味的事实。我们称此类<动词>为知觉<动词>，常用的有 see，watch，notice，look at，hear，listen to，feel 等。变成<被动语态>时，<受词补语>要变成<不定词词组>，如例句4。这些词后也可接现在<分词>，强调“动作进行”，而接原形<动词>，则强调“整个事实”。

Did you notice anyone come in?
你注意到有人进来过吗？
As far as I remember, I have never seen him smile.
在我记忆中，我从未见他笑过。
She once heard him whisper to another girl.
她曾听到他对另外一个女孩说悄悄话。
He was heard to sing.
我听到他唱歌。
I felt my heart beat violently.
我感觉到自己的心跳得很厉害。
She liked to listen to children talk.
她喜欢听孩子们谈话。
We heard him playing with his puppy.
我们听到了他在玩着他的小狗。
Rick often watched the boats returning to port in the late afternoon.
瑞克常常看到小船在傍晚正回到港口。