动词的分类：行为/实义动词、及物与不及物动词、瞬时与持续动词、状态与动作动词、 助动词、情态动词与连系动词

1. There is someone knocking at/on the door. Who ________ it be?

  A) may            B) will            C) can          D) must

情态动词与虚拟语气

（全国I 29）. Just be patient .You_____________ except the world to change so soon.

A. can’t            B. needn’t        C. may not         D. will not

“I still vividly remember what my village looks like. I __________ think about what color should be used,” Chang Xiufeng, the “van Gogh grandmother” said. 【黑龙江省哈市五县2011年高考模拟试卷英语卷（22）】【情态动词】