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-Could I smoke here? --Look at the sigh "No smoking"

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-Could I smoke here? --Look at the sigh "No smoking"
回答是No,you mustn't.
为什么用must?它不是主观吗?用have to 行吗?
风唱梵音求教
-Could I smoke here? --Look at the sigh
-Could I smoke here? --Look at the sigh "No smoking"
我能在这吸烟吗? --上面写着"禁止吸烟"
must肯定式表必须,must't 表示不许,不能.(没有什么主观性)
have to :不得不
eg. I have to get up before 7o'clock
我不得不在7点钟之前起床