No one is able to do it .没人能做这件事.
Will you be able to come tonight ?你今晚能来吗?
I’m sorry I haven’t been able to answer your letter .对不起我一直没能给你回信.
She said she had not been able to come earlier .她说她没有能够来得更早一些.
但是,在表示成功地完成某一具体动作时,通常不用could ,而用was /were able to 来表示.这时,was /were able to 相当于managed to 或succeeded in doing ,表示经过一番努力,终于能够……。例如:
1) Were able to escape
Below the 11th
2)Managed to escape
into the street .
Floor, people
3)succeed in escaping
11楼以下的人们逃到了大街上。
3.May
1)表示许诺“可以”或询问、说明一件事。
注意:回答may 引起的问句时,否定形式用must not /mustn’t (禁止),had better not (最好别)。May not 比明确的表示禁止的must not 较为委婉,一般很少用。例如:
May I trouble you with a quesiton?我能打扰一下问你一个问题吗?
—Could I call you by your first name ?我可以直接称呼你的名字吗?
—Yes ,you may .行。(98上海高考)
People may not pick flowers in this garden .本园花木不得攀折。
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