Question

if it will be rain tomorrow,we won't go on a picnic。

if it will be rain tomorrow,we won't go on a picnic。
还是
if it will be rain tomorrow,we don't go on a picnic
跟“主将从现”有关吗？

Answer 1

两句都不对噢

应该是：If it rains tomorrow, we won't go on a picnic. 明天下雨的话，我们就不去野餐了。
从现 主将

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Answer 2

应该是 If it rains tomorrow , we won't go on a picnic.
if从句用现在时表将来，主句用将来时，是主将从现原则。

Answer 3

主将从现If it rains tomorrow, we won't go on a picnic.

Answer 4

首先if it will be rain就是错的，应改为if it rains tomorrow（这个才是从句！现在时）其次是主将从现的条件状语从句，主句用将来时won't。