be动词什么情况下 用原形 谢谢
将来时态: will/would/shall/should + be
used to be
情态动词后,如:must/can/may/could/might等等 + be
虚拟语气:should +动词原形
如: The teacher required that we should be careful in our lessons.
将来时态: will/would/shall/should + be
used to be
情态动词后,如:must/can/may/could/might等等 + be
虚拟语气:should +动词原形
如: The teacher required that we should be careful in our lessons.