Stop the traffic,if there ___an accident.A will be B.is .B .

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Stop the traffic,if there ___an accident.A will be B.is .B .请问 A为什么不对?
我知道if 条件句“主将从现”,可是主句也没用将来时啊.怎么能说的通?

这是假设句/条件句啊,当然用一般现在时啦,所以用is.因为there is an accident是一个条件或者说一个假设 .而且你用了if 就不应该用will be.已经if了怎么还能准确预测到而用will be呢.
再问：是只要出现if 条件句了就一定不能用将来时了么谢谢
再答： .......起码同一叙述下不可以，但是就如楼上给的例子同一句不同叙述上是可以用的。我再给个例子，if you are not going to leave, I will call police. 这是一个条件句，你看我在用if的时候后面不是will be而是 be。 if there is an accident, the traffic should be/shall be stop. 这里也不能用will be（我用了should be 或这shall be），因为你不是神，你不能预测交通会不会中断。
再问：麻烦你还得解释一下什么叫同一个句子不同叙述啊你给的句子我感觉和不能用将来时的句子没什么区分啊我愚昧费心了
再答：例如if you are not going to leave这是一个叙述， I will call police这是另一个叙述，把两个连在一起这是一个句子，我不能说是一个句子只能说城市一个叙述了。

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