if it -----tomorrow,we will not go out for a picnic

If it should rain tomorrow,we will not do
谓语动词的虚拟形式
从句\x09 主句
现在 动词过去式（be 多用were）\x09 would / should / could / might + 动词原形
过去\x09had + 过去分词\x09 would / should / could / might + have + 过去分词
将来 动词过去式或 should / were to + 动词原形\x09would / should / could / might + 动词原形
再问： 可是主句是we will not do 没有would阿
再答： 你确定题对着呢？
再问： 确定呢..没抄错阿.