情态动词只有情态意义，即它所表示的是说话人对动作的观点，如需要、可能、意愿或怀疑等。
情态动词的特征：
1.在形式上，情态动词没有实义动词的各种变化。
2.在意义上，大多数情态动词有多个意义。
3.在用法上，情态动词与助动词一样，须后接动词原形。
情态动词各自的基本意义及用法
一、can 与could用法对比表
对比点 can could
1、表“能力” Can you lift this heavy box? I couldn’t understand what he said at all.
2、表“许可” You can use a different material instead. He said I could borrow his bike.
3、“怀疑” No， no， it can’t be true.
What on earth can this mean? We thought the story could not be true. How could you be so careless?
4、can与be able to 区别 1. could代替 can，表示语气更为婉转。
Eg. Could I use your bike? Yes， you can.
2. can (能够)=be able to(仅表能力时)，但be able to 表示一番努力后，才能做得到，且有更多的时态。
He was a good swimmer， so he __________ swim to the river bank when the boat sank.
A. could B. might C. shall D. was able to
二、may与 might用法对比表
对比点 may Might
1．表“询问” May I …?(=Can I …?) Might I …?(=Could I…?)(但比用may 更客气)
2.表“允许” You may take the boy there. He told me he might come .(might 与told相呼应)
3．表“可能”“或许” She may nor like this place. I’m afraid he might not like this play.
注： 1. May I…?的答语。
2.may可表示期望或祝愿
May you succeed !
3.may (might)用于目的状语从句中 肯定：Yes， you may.
否定：No， you mustn’t 不行（语气强硬）
No， you may not 或No， you’d better not.
The emperor gave them some gold in order that they might begin their work at once.
三、must与have to的用法对比表
对比点 must have to
1．表“必须” （主观看法）必须；没有过去式，可用于间接引语中。He told me I must do according to what he said. （客观需要）不得不，有多种时态。It’s raining heavily， we can’t go now.
2.疑问句 Must I …?
Yes， you must.（一定）
No， you needn’t./ you don’t have to.(不必) Do you have to go today?
Yes， we do.
否定句：You don’t have to worry about that.
四、need与dare的用法对比表
对比点 need dare
1.情态动词+动词原形
1）否定式
2）疑问式 He need not (needn’t)go.
----Need we do it again?
---No， you needn’t do it again. He dare not say so.
Dare she go out alone at night?
How dare you say I’m unfair?
If he dare do that， he’ll be punished.(条件句)
I dare say.(固定用法)
2.行为动词+带to不定式
1）肯定式
2）否定式
3）疑问式 He needs to go.
He doesn’t (does not)need to go.
Does he need to do it again?
No， he doesn’t need ot do it again. He dares to say.
He does not(doesn’t)dare to say.
If you dare to jump into the water from here， so dare I .
3. did not need to do
表示过去没有必要做 She didn’t need to attend the meeting yesterday， and she stayed with her children.(她没有参加)
五、should与ought to用法对比表
对比点 should ought to
1、表“应该” 表劝告、建议
You should listen to the doctor’s advice.
We should learn from Zhang Hua 表示“有责任有必要”做某事
You ought to finish your work before you go home.
We ought to help each other.
2、表“估计”
They should get home by now. 表示“非常可能”的事，可译为“总应该”
If we start to work right now， we ought to finish it before lunch.(午饭前应当能干完)
注： 1）、should还可在虚拟语气中的使用
2). 注意：ought to的疑问式及否定式
----Ought he to go? ----Yes， I think he ought to.
No， he oughtn’t to.
否定式：ought not to a或oughtn’t to do(不说ought to not do)
反疑问句：oughtn’t ______?
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