has he sent the letter? does he send the letter? 有何不同啊,翻译上

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has he sent the letter? does he send the letter? 有何不同啊,翻译上

has he sent the letter? does he send the letter? 有何不同啊,翻译上
has he sent the letter? does he send the letter? 有何不同啊,翻译上

has he sent the letter? does he send the letter? 有何不同啊,翻译上
他已经发了信吗?完成时,强调已完成.
他是不是经常发这种信?一般时表示经常做,

has he sent the letter?他把信寄出去了吗?(强调时态,隐含意思:他已经把信寄出去了吗)
does he send the letter? 他寄信了吗?(强调状态,单纯的询问又还是没有)