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

问题描述：

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

1.可以
都是将来式，be doing sth
2.没有这种说法
如果要用的话要用may ,表可能

答

不可以趋向动词 go come fly leave 一般都用－ing 形式表将来时态

答

1.when are you flying to Beijing?可不可以用when will you fly to Beijing?请说理由
一样.这里的be+doing是表示将来的意思
相似的有I am leaving in 5 mins.我将要在5分钟之内离开.
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
that boy can be li lei.语法没错但是有欠通顺
和中文一样
A:那个男孩一定是lilei
B:他不可能是lilei
A:那个男孩可以是lilei
B:他不可能是lilei
明白了么?

答

be going to 表示有计划的,主观的. 可以用will代替,但意境有点不一样.
must be 一定是
can't be 不可能是
can be 可能是
如果用can be代替must be 表达的意思不一样

答

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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