误Tom laughed this idea.
正Tom laughed at this idea.
析laugh作“嘲笑”解时,是不及物动词,其客体必须由介词at引出。
他的笑话常常使我们笑出眼泪来。误His jokes often make us laugh to tears.
正His jokes often make us laugh ourselves to tears.
析表示“笑出眼泪”,英语是laugh oneself to tears,不能省略oneself一词。
误They gave loud laugh.
正They gave a loud laugh.
析laugh作名词表示“笑声”时是可数名词,前面可以加不定冠词a。