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Mother'Day is celebrated at different times in different cou

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Mother'Day is celebrated at different times in different countries.
请问这句话为什么要用“is celebrated”而不用“celebrates”、“celebrate”、“was celebrate”呢?
Mother'Day is celebrated at different times in different cou
这句话是被动句句中省略了主语,mother's day是被庆祝的,所以用is celebrated表被动语态,而不用celebrates或celebrate
.若说我们庆祝mother's day 就是主动句就可用We celebrate mother's day 或People celebrate mother's day
并且庆祝mother's day是表示这个现象普遍存在,过去现在将来都在庆祝所以用is celebrated.而was celebrated只表示过去庆祝.