如:Why don’t you buy a book for your son? 给你儿子买 本书怎么样? Why don't we come more often? 我们为什么不经常来 这里呢?' Why don't you do it this way? 为什么不用这种方法做呢? Why don't you have another try? 为什么不再试一次呢? 这个句子还可以写成 Why not do....