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should和could都是情态动词,后接动词原形,没有人称和数的变化,它们的否定形式为shouldn’t和couldn’t。下面我们一起看看它们的“情态观”吧。
Both should and could are modal verbs, followed by the verb prototype, without any change in person and number, and their negative form should not and could not. Let’s take a look at their “modality concept ”.