1.when are you flying to Beijing?可不可以用when will you fly to Beijing?请说理由

1.when are you flying to Beijing?可不可以用when will you fly to Beijing?请说理由

题目
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
答案
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
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