求详细解释所有选项的区别!You _____ do what you like this evening?A.could B.can C.are able to D.can be able to求各选项的详解.

Question

求详细解释所有选项的区别!
You _____ do what you like this evening?
A.could B.can C.are able to D.can be able to
求各选项的详解.

Answer 1

选择 B
can 可以用来表示“能力”以及“客观的可能性”等,此处指“客观的可能性”.could 是 can 的过去式,也有上述用法,但在此处不符合,因为后面的时间this evening 是将来的时间.
be able to do 指的是“能力”,没有“客观可能性”这层含义,故不能选择C项 例如：I`ll be able to speak Enlish in a few months.
D项 can 与be able to do 不能重叠使用.
误：He can be able to do it well.
正：He can (或 is able to) do it well.