can, may, shall都可以用于第一人称表示请求,它们之间有什么区别呢?
______ I have a word with you? It won't take long.
A. Can B. Must C. Shall D. Should
这道题的答案是A。为何不能用shall?
一______ I turn on the TV for you,Grandpa?
一Yes,thanks a lot,my dear. You’re so considerate.
A.May B.Shall C.Will D.Need
这道题的答案是B。为何不能用may?