She tried to persuade him not to smoke,but he_______listen.答案是wouldn't告诉我为什么是这个.顺便告诉我couldn't shouldn't wouldn't的区别.谢谢了^-^

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She tried to persuade him not to smoke,but he_______listen.答案是wouldn't告诉我为什么是这个.顺便告诉我couldn't shouldn't wouldn't的区别.谢谢了^-^
She tried to persuade him not to smoke,but he_______listen.
答案是wouldn't告诉我为什么是这个.
顺便告诉我couldn't shouldn't wouldn't的区别.谢谢了^-^

She tried to persuade him not to smoke,but he_______listen.答案是wouldn't告诉我为什么是这个.顺便告诉我couldn't shouldn't wouldn't的区别.谢谢了^-^
wouldn't do something的一层意思就是过去常常不做某事,前面说她尽力说服他不要吸烟,因为TRY用了过去时,所以用wouldn't
couldn't shouldn't 都是不许的意思,但是前者的语气更重,强调不准,后者语气更轻,强调不应该
wouldn't的意思已经说了

但是他不听~~
but he couldnt listen.他听不见.
but he shouldnt listen.他不应该听.

couldn't 是用在表示委婉的拒绝,是can't的委婉形式,也用在过去式中,有委婉表达的意思.
shouldn't是表示不应该怎样做,有虚拟的成分在里面,表示本应该怎么做而没有做.
wouldn't是表示过去到现在都没有发生的事情.也可以说是一般现在式.