情态动词的语法特征 情态动词, 语法, 特征

x-ace

　1） 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。
　2） 情态动词 除ought 和have 外，后面只能接不带to 的不定式。
　3） 情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。
　4） 情态动词没有非谓语形式，即没有不定式，分词，等形式。

zhycomeon

If  some examples are given  , it would be great

halo

hello,zhycomeon,we will take your advice into consideration,and now I think you can list some example by yourself to practice what you learned.
2# zhycomeon

kkdashe

1.She must / may / might / could arrive before 5.
2.We used to grow beautiful roses.
   I asked if he would come and repair my television set.
3.She dare not say what she thinks.
   They need not have been punished so severely.
4.Still, she needn't have run away.
情态助动词之间是相互排斥的，即在一个限定动词词组中只能出现一个情态助动词，但有时却可以与have和be基本助动词连用：
　　You should have washed the wound.
　　Well, you shouldn't be reading a novel.

hwkenan

不太明白