My grandma is over seventy,but she can still read without glasses.
They will be able to tell you the news soon.
He was able to flee Europe before the war broke out.
2.表示允许可用can或could,与may/might意义接近。could可用于现在时,只是语气更加委婉、客气,回答时则一般要用can而不用could。
—Could I have the television on?
—Yes,you can./No,you can't.
二may与might
1.表示允许,意为“可以,许可”,用法基本上同can与could。如:
May I use your bicycle?
2.表示可能性,意为“也许,可能”。如:
According to the weather forecast, it may rain tomorrow.
3.may可以放在句首,表示祝愿。如:
May good luck be yours!
三must与have to
1.must用来表示说话人的主观看法;have to表示客观的需要,强调外界压力,不得已而为之。如:
He said that they must work hard。
他说他们必须努力工作。(主观上要做这件事)
My brother was ill, so I had to call the doctor in the middle of the night.
我弟弟生病了,我只得半夜里把医生请来。(客观上需要做这件事)
2.表示“不必”,须用don't have to或needn't。must的否定式表示“禁止,绝对不可”。如:
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