could you give me a hand with this box?can you give me a hand with this box?的区别could can

could you give me a hand with this box?can you give me a hand with this box?的区别could can

题目
could you give me a hand with this box?can you give me a hand with this box?的区别could can
意思是Can you 开头的句子都可以有could you?
答案
不是所有 can you 开头的问句都可有 could you 代替could you 是 can you 的委婉语态,因此请求问句 can you 可改用 could you,但其他情况下不可,比如can you walk,or would you like me to get a taxi for you?我是...
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