if it won't rain tomorrow,we'll go for a picnic.这句话那错了?won't变doesn't 为什么呢?

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if it won't rain tomorrow,we'll go for a picnic.这句话那错了?won't变doesn't 为什么呢?

把won't 改为doesn't就对了.在if条件句中,一般用一般现在时表将来