We will have a picnic if it is fine tomorrow这句话为什么不可以说成We will have a picnic if it will be fine tomorrow?

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We will have a picnic if it is fine tomorrow这句话为什么不可以说成We will have a picnic if it will be fine tomorrow?
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We will have a picnic if it is fine tomorrow这句话为什么不可以说成We will have a picnic if it will be fine tomorrow?
We will have a picnic if it is fine tomorrow
这句话为什么不可以说成We will have a picnic if it will be fine tomorrow?

We will have a picnic if it is fine tomorrow这句话为什么不可以说成We will have a picnic if it will be fine tomorrow?
if引导的是从句...主将从现...当年一直这么说的说...