区分be able to和can.My brother( )swim very well.介词填空.The boy is excited( )the good news.

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区分be able to和can.My brother( )swim very well.介词填空.The boy is excited( )the good news.

1.can只有“现在式和过去式”;
I can swim.
He could run after the bus ancatch catch it twenty years ago.
be able to除了有“现在式和过去式”外,还有“未来和完成”的概念.
Can you ride on a bicycle
I shall not be able to come again today.
I shall have been albe to do something.
2.过去式的“could”表示过去的“能力”、“潜力”和“可能性”.如:
Lanny could run and was a good tennis player
I could run after a bus and catch it twenty years ago
过去式的“was/were was/were able ”不能单纯的表示过去的“能力”、“潜力”和“可能性”;只能表示“能力 + 成功的完成一个动作”而且更加侧重强调后者.
填空题答案:
can
about

can
about

表示能力时,be able to ,can 意义相同。但用法有所区别,
be able to有多种时态;而can 只有一般现在时和一般过去时的时态,在一般现在时和一般过去时两种时态中,二者可以相互互换。
can还可以用于表示猜测,许可等,而be able to不能。
be able to强调能力,be able to do sth.
can 可以,会做,某事。不强调...

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表示能力时,be able to ,can 意义相同。但用法有所区别,
be able to有多种时态;而can 只有一般现在时和一般过去时的时态,在一般现在时和一般过去时两种时态中,二者可以相互互换。
can还可以用于表示猜测,许可等,而be able to不能。
be able to强调能力,be able to do sth.
can 可以,会做,某事。不强调能力。
填空答案是:can;about.
懂了么?

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can有时可以表示可能性:
I can have lunch with your tomorrow if you like.
在表示天生的或学到的能力时,can/could可用于现在时和过去时,can/could与
示将来的“能力”时,则用 will be able to:
I could drive a car by the time I was...

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can有时可以表示可能性:
I can have lunch with your tomorrow if you like.
在表示天生的或学到的能力时,can/could可用于现在时和过去时,can/could与
示将来的“能力”时,则用 will be able to:
I could drive a car by the time I was sixteen.
I tried again and found I could/was able to swim.
Can Jane swim yet?
No, but she’ll be able to swim in a few months’ time.
在谈到说话时正在发生的事时,一般不用 be able to:
Look! I can stand on my head.
在表示成功地完成某一具体动作时,通常不用 could,而用 be able to;如果表
可用 couldn’t:
It’s pity he couldn’t visit Mary.
be excited at “在。。。。。。的影响下而激动
be excited about “关于某事而激动”
常可以互换
填空 can , at/zbout

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