If the weather had been better ,we could have had a picnic.
这是个表示与过去事实相反的虚拟语气的句子,意思和含义是：如果天气好些的话,我们就可以去野餐了（实际是,过去的时候天一直不好,所以我们野餐没有去成）
因此后面it rained all day,表示实际上过去一整天下雨.
或者用过去进行时也可以,it was raining all day.整天都“在”下雨（强调在下雨）
If the weather had been better ,we could have had a picnic.But it(rained) all day 为什么用过去时态
If the weather had been better ,we could have had a picnic.But it(rained) all day 为什么用过去时态
If the weather had been better ,we could have had a picnic.But it(rained) all day 为什么用过去时态
If the weather had been better ,we could have had a picnic.But it(rained) all day 为什么用过去时态
英语人气：799 ℃时间：2019-09-29 03:30:51
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