can,should,must,needd的区别(请说的详细点)
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can,should,must,need的区别can: 能够;能,会,意愿一般表示能力,同be able to如 I can sing the song(我能唱那首歌),也可表示意愿如 I can be back this afternoon(我会在下午回来)should: 应该(怎么样),需要(怎么做)表示应该怎么样(办)如 We should complete the job by today(我们应该在今天内完成这工作)一般should后直接加动词原型,不加tomust: 必须,和should比起来更强烈,表示一定要(作)如 We must complete the job by today(我们必须在今天内完成这工作)一般must后直接加动词原型,不加toneed: 表示要求,需要need后可跟动词或名词,如加动词需加to如:You need to rest your feet(你需要休息一下)再如:I need your help。希望这些回答可以让你make sense:)。
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I can respond to this question, But I can not tell you in detail;You should ask help for someone else;Anyway, you must help youself in dictionary;You need to do like this!
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might/may/could/can/should/ought to/would/will/must语气由弱增强
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依次是可以(有能力);应该=ought to;必须;需要