A strong wind added to his difficulty,but he was able to swim across the channel.
2.may 和might
①表示“许可”或征询对方许可。否定回答时,根据语气的强弱依次为may not,had better not 和mustn’t.
You may use the phone.(现在)
He said I might use the phone.(过去)
—May I go out with him?
—Yes,you may.
—No,you may not/had better not/mustn’t.
②表示可能性,有“或许,可能”的意思。用might语气更加没有把握,指现在时间。
John should arrive here before eight,but he may not,He is often late.
I’m not sure whether I’m coming to the party.I might go to the night school instead.
3.must 和 have to
①must表示“必须,应该”,是说话人的主观看法。have to 表示“必须”“不得不”,表示的是客观需要。must只有一种形式,have to 有has to,had to,will have to 等多种形式。
I don’t like the flat.I must buy another one.
The flat is too small for five people.I have to buy a large one.
②“mustn’t”表示“不应该”“不许可”“禁止”“不准”。因此在回答must问句时,否定式常用needn’t或don’t have to。
You mustn’t climb that electrical pole.
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