起构常见情态动词讲解一、情态动词的定义:情态动词有词义,但它不能单独作谓语,它必须和其他动词谓语
情态动词没有人称和数的变化;它的后面必须跟动词原形
二、情态动词的种类:情态动词词义否定形式词义can能够,会can't不能,不会could能够,会couldn't不能,不会may可以//must必须mustn't不允许,不能shall将,要shan't将不要should应该shouldn't不应该need需要needn't不必would将会,愿wouldn't不会,不愿三、情态动词的用法及主要句型:1、CanIhelpyou
——Yes,please
/No,thanks
2、Can+主语+动词原形
Yes,〜can
No,〜can't
3、CanIborrowyourbook
Yes,ofcourse
4、CanIwriteonthebook
No,youcan't\mustn't
5、Could\Canyouhelpme
Yes,ofcourse
\Certainly
6、Could\CanyoutellmethewaytotheZoo
7、MayIcomein
Comein,please
8、MayIsithere
Yes,please
\Sorry,pleasedon't
9、MayIhavesomeCoke
Yes,ofcourse
10、May/Could/CanIspeaktoTom
Speaking
Who'scalling
11、should、shouldn't 表示劝告:1)Heshouldgetupearly
2)Sheshouldn'tplaycomputergametoomuch
12、Should+