有没有be heard doing的说法

有没有be heard doing的说法
看一个例句:he is heard to sing now./he was heard to sing just now 这里为什么用sing,我想都是短暂的动作不应该用singsing吗?
英语人气:974 ℃时间:2020-04-04 05:08:46
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有be heard doing 的用法.请看例句:1.I often hear him sing in the morning.(改为被动语态)(我经常听到他早晨唱歌,hear sb.do sth.)He is ofen heard to sing in the morning.2.I heard him singing just now.(...
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