These people / those rules / those buildings. Delivery has failed to these recipients or groups的意思是邮件发送失败，未能成功投递给这些收件人或邮件组。 详细解释： 1. 你可以这样回答： “these are grass.” 或者更自然地，“this is grass.” 因为即使他们用了“these”，我们仍然知道“grass”是不可数名词，所以使用“this is”是更准确的。 但在非正式语境中，人.
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Be动词单数后面就配单数，复数后面就配复数。或者其实因果是反过来的，因为this是单数，所以is；因为these是复数，所以是are。 一言蔽之，不可以说what’s these, 一定要 what are.
Those / these are determiners and are used before nouns to refer to a particular group of things / people, e.g.
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