hear sb. do sth.         hear sb. doing sth.

Mr Brain has just heard Zheng Jie playing the piano in a concert . 布雷恩先生刚刚听了郑杰在音乐会上的钢琴演奏。

    I read about you in the newspaper and decided to come and hear you play .

    Fortunately people want to come and hear me play .

    【 讲解 】①在上述三个句子中，可归纳为“主语 + 谓语 +  宾语 + 宾语补足语”的结构。其中的宾语补足语可以是不带 to 的不定式 ( play ) , 也可以是 v - ing 形式 ( playing ) .

    ②在 see , hear , feel , watch , notice 等表示感觉的动词后，既可用 v - ing 构成复合宾语，也可用不带 to 的动词不定式构成复合宾语。两者之间有时有差别。用 v - ing , 表示动作正在进行，即处于发生的过程中，还没有结束；用不定式则表示动作发生了。hear sb . do sth . 只说明“听到某人做某事”这件事，强调结果，故常用来表经常性和重复性行为，hear sb . doing sth . 强调“听到某人正做某事”。类似的动词还有 see , notice , look at , listen to等。试比较：

    Do you hear someone knocking at the door? ( 讲时还在敲 )

    I heard someone knock at the door three times . ( 讲时敲的动作已结束 )

    I noticed her coming into the room .

I noticed her come into her room and sit down on one chair .