加ing虽然某些动词如:see, hear, notice, watch.等后接动词-ing 形式或不定式(不带to)作宾语补足语都可以.但意思上有区别.比较:I saw them playing basketball at 5 p.m. yesterday.(打篮球的动作正在进行,表示部分进行着的动作.)I saw them play basketball yesterday. (打篮球的动作已完成,表示全过程的动作.)练习: 用所给的适当形式填空.1). We watched them ________ (get) off the bus,__________ (cross) the street and
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