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重庆大学版英语（必修）英语2一年级《Theme A Learning to Be Relationship Between Friends Unit 1 Friends and Friendship Grammar》优质课教案
2.后接动词不定式一律不带to
3.不随人称和数的变化。
情态动词各自的基本意义及用法
表一、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 could代替 can，表示语气更为婉转。
Eg. Could I use your bike? Yes, I can
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
表二、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： 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. 表三、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.
表四、need与dare的用法对比表
对比点 need dare 1.情态动词+动词原形