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can,could和be able to的区别 can 与be able to在用法上既有相同的一方面, 又有不同的地方,这是应该引起注意的。当它们表示能力的时候,是同义的。如: He can speak two foreign languages. He is able to speak two foreign languages. 它们...

前者是有能力做某事,主语为人 后者是有可能做某事,主语为it is,如果要加上人,就该是it is possible for sb to do 例: He is able to speak English well. It is possible for him to speak English well.

(1) be able to 强调通过努力而获得的能力,而can则强调自身已具有的能力.如: She can sing the song in English.她能用英语唱这首歌. He will be able to sing this song in English in a few minutes,too.几小时之后,他也能用英语唱这首歌. (2...

can,could和be able to基本相同,在很多语境下是可以互相换着用的,但是也还有点不同 1.be able to强调一个人有能力去做,就是有本事的意思 2.can,could表示能够,是情态动词,很多时候是一种推测的语气. 比如,你能帮我吗? 如果用can/could来问,那这...

基本释义:当它们表示能力的时候,是一样的。如: He can speak two foreign languages. He is able to speak two foreign languages. 区别: 1. can只有两种时态, 即can 和could, 而be able to 有多种时态, 如was/were able to, will/shall be ...

句子中be able to do 是谓语 be able to 是情态动词,与后面的动词一起构成谓语。 如: 1.He is able to swim . (主谓结构) ( 谓语:is able to swim) 他会游泳。 2. He is able to speak English . (主谓宾结构) ( 谓语:is able to speak...

can 和be able to 都可以表示能力.can泛指一般的能力,而且只有两种形式,即:can,could.be able to 则主要指具体做到了某件事的能力,其形式主要是靠be 发生变化,所以形式比can 多.可以说:I can swim.I am able to swim.但是不能说:All the peo...

can与be able to表示能力的时候,是同义的。如:He can speak two foreign languages.He is able to speak two foreign languages.它们用法上的不同主要体现在以下几方面: can只有两种时态,即can和could,而be able to有多种时态,如was/were ...

be able to 与can用法区别 1.can表示“能力”时,和be able to相当,许多场合都可以互相替换。但当叙述过去经过一番努力才能完成的事情或前面有特殊说明,表示你有能力时,只能用be able to。 【正】Can you speak any foreign languages? 你会说...

Won't be able to 不能 He won't be able to get back for a couple of days. 他一半天回不来。 ----------------------------- 希望采纳,你的支持我们的动力!

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