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. Im 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 mustnt 不行(语气强硬)
No, you may not 或No, youd 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。Its raining heavily, we cant go now.
2.疑问句 Must I ?
Yes, you must.(一定)
No, you neednt./ you dont have to.(不必) Do you have to go today?
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