我不是要be able to和can的区别和用法,我是要be able to和are/is able to的区别和用法.是有一道题:Nowdays people can travel to many places by air.保持句意不变.我把can改成了be able to,但是答案是are able to.所以

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我不是要be able to和can的区别和用法,我是要be able to和are/is able to的区别和用法.是有一道题:Nowdays people can travel to many places by air.保持句意不变.我把can改成了be able to,但是答案是are able to.所以
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我不是要be able to和can的区别和用法,我是要be able to和are/is able to的区别和用法.是有一道题:Nowdays people can travel to many places by air.保持句意不变.我把can改成了be able to,但是答案是are able to.所以
我不是要be able to和can的区别和用法,我是要be able to和are/is able to的区别和用法.
是有一道题:Nowdays people can travel to many places by air.保持句意不变.我把can改成了be able to,但是答案是are able to.所以我想问问有何区别.

我不是要be able to和can的区别和用法,我是要be able to和are/is able to的区别和用法.是有一道题:Nowdays people can travel to many places by air.保持句意不变.我把can改成了be able to,但是答案是are able to.所以
嗯哼~其实be able to 的be呢是be动词,包括is ,am,are,而be able to呢是一种形式,具体要看主语了.