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1.when are you flying to Beijing?可不可以用when will you fly to B

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1.when are you flying to Beijing?可不可以用when will you fly to Beijing?请说理由
2. A:that boy must be li Lei.
B:he can't Li Lei . Li Lei went to his hometown three days ago.
可不可以用 A:that boy can be li Lei.请说理由
must be 一定是 can be 可能是
下句B:he can't Li Lei . Li Lei went to his hometown three days ago.不是说明上句可能是吗
1.when are you flying to Beijing?可不可以用when will you fly to B
第一个问题,可以,两种说法都对
第二个,must be 意思是说,说话的人很确定这个人就是li lei不能用can be,因为和整个语境不符