考研英语的语法速成：几个情态动词常考句型

　　1).may/might as well 不妨，最好，与had better相近;

　　Since the flight was cancelled, you might as well go by train.

　　既然航班已经取消了，你不妨乘火车吧。相当于you had better go by train。

　　2) .cannot / canttoo 越越好，怎么也不过分。注意这个句型的变体cannotover.如：

　　You cannot be too careful when you drive a car.驾车时候，越小心越好。

　　The final chapter covers organizational change and development. This subject cannot be over emphasized .

　　3) .usednt 或didt use to 为used to 的否定式。

　　4).should 除了应该一层意思外，考研大纲还规定要掌握其竟然的意思。如：I didnt expect that he should have behaved like that. 我无法想象他竟然这样做。