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

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Iftheweatherhadbeenbetter,wecouldhavehadapicnic.Butit(rained)allday为什么用过去时态Iftheweatherhadbeenbetter

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

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.
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)

这是虚拟语气。假设状语从句用过去完成时,主句用过去时 。表示与事实相反。

虚拟语气,假设的一个条件。

因为这句话是对过去发生事情的虚拟。
与过去事实相反:条件从句,If I(we,you等)+had+过去分词,结果主句,I(we,you等)+would/could+have +过去分词.
所以If the weather had been better ,we could have had a picnic.这句话是对过去的虚拟.因此But it(rained) all day ...

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因为这句话是对过去发生事情的虚拟。
与过去事实相反:条件从句,If I(we,you等)+had+过去分词,结果主句,I(we,you等)+would/could+have +过去分词.
所以If the weather had been better ,we could have had a picnic.这句话是对过去的虚拟.因此But it(rained) all day 用过去时,是过去的事情了。

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