Our products__(guarantee)for 3 years. 怎么填?为什么?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/18 09:59:33

这就扯得远了.
答案是 are guaranteed 因为是“被动语态”表述.
产品本身无法保证自己,只能用被动语态表达它的“保证期”,
而且这里是说明常态,所以无需用完成时.
再问：为什么不能用have been guaranteed?
再答：这句话是商家说给顾客听的（或写在广告词里的）意思是“我们的所有产品都有3年（质量）保证” 用现在式的目的就是说明这是一种“常态”。用完成时 have been guaranteed 语法上并没问题，语境上就完全不合适了。

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