2.后接动词不定式一律不带to
3.不随人称和数的变化。
情态动词各自的基本意义及用法
表一、can 与could用法对比表
对比点 can could
1、表能力 Can you lift this heavy box? I couldnt understand what he said at all.
2、表许可 You can use a different material instead. He said I could borrow his bike.
3、怀疑 No, no, it cant be true.
What on earth can this mean? We thought the story could not be true. How could you be so careless?
4、can与be able to 区别 1. could代替 can,表示语气更为婉转。
Eg. Could I use your bike? Yes, I can
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2016-02-29
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