could除了can的过去式还有什么理解 can could may must should的区别?
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could除了can的过去式还有什么理解 can could may must should的区别?
could的非过去式用法:
指现在或未来的"能力"(ability in the present)或者"意愿"(willingness):
*Right now I could eat an ox.(指现在)
*Could you run the business by yourself?(指现在)
*Come when you like,I could see you at any time.(指未来)
*Perhaps I could see you tomorrow.(指未来)
*Maybe we could go shopping this evening.(指未来)
情态动词中 can语气没有could委婉,表推测时都表示可能,否定是不可能,一般不用于肯定句
表推测时,may表可能,否定是可能不;must表一定,不用于否定句;should表应该.
mustn't只表禁止.
再问: 那 这只猫肯定不是他的 怎么说呢,
再答: 语气很强烈,很肯定,最好用can't来造句子,couldn't相对委婉。
指现在或未来的"能力"(ability in the present)或者"意愿"(willingness):
*Right now I could eat an ox.(指现在)
*Could you run the business by yourself?(指现在)
*Come when you like,I could see you at any time.(指未来)
*Perhaps I could see you tomorrow.(指未来)
*Maybe we could go shopping this evening.(指未来)
情态动词中 can语气没有could委婉,表推测时都表示可能,否定是不可能,一般不用于肯定句
表推测时,may表可能,否定是可能不;must表一定,不用于否定句;should表应该.
mustn't只表禁止.
再问: 那 这只猫肯定不是他的 怎么说呢,
再答: 语气很强烈,很肯定,最好用can't来造句子,couldn't相对委婉。
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