hear sb do sth 是省略了to的动词不定式,
意思是：听见某人做某事,强调过程,或者经常性
被动时还原to,即：sb is heard to do sth
hear sb doing sth
意思是：听见某人正在做某事
Hear sb to do sth 和 hear sb doing sth
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hear sb do sth 和 hear sb doing sth 有什么区别?
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hear sb.doing sth.加不加be动词?