是直接用would should could might就表推测吗,那would be should be could be might be又表什么?must may can shall can呢?
追答可见你对情态动词的理解太浅,情态动词随叫动词,但是他不能单独构成谓语,后边必须还要接实义动词才可以,所以此四词后边必须加其他动词,不一定是be动词,也可以是其他的,比如,You must know this,你肯定知道这个的(说是肯定,其实是推测,你仔细揣测一下,这和汉语一样的),而在虚拟语气中只能用would should could might表推测,用法也是一样。