He 'll go fishing if (doesn't rain)
条件状语从句,主句一般将来时,从句要用一般现在时
答案补充：
一个完整的句子必须要有动词作为谓语,可以是Be动词（如am,is,are）,可以是实义动词（如make,stand),在这样的否定或疑问句中没有动词我们就用助动词do来帮助保持句子的完整性,所以要用doesn't rain~
不用not rains的原因是,没有这样说的,有not在前面,体现第三人称单数形式的"s"就要表现在助动词does上.
he’ll go fishing if _____(not rain).
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