Our plans were upset by the sudden change in the weather.中为什么用were而不用are

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Our plans were upset by the sudden change in the weather.中为什么用were而不用are

时态.were一般过去时,are一般现在时.
这件事是过去发生的,是已经发生的,一般现在时则表示时常、普遍会发生的事情.

因为这件事已经发生过了所以用过去式Were