要说窍门，在多背一些动词的不规则过去式后，你会发现还是有一些规律的。
Speaking of the knacks, when you know the past forms of some irregular verbs, you will find some rules.
虚拟语气后动词要用过去式我们作出决定如果天下雨我们就留在家里 …
We made a decision that if there would be rain, we should stay at …
虚拟语气后动词要用过去式我们作出决定如果天下雨我们就留在家里 …
We made a decision that if there would be rain, we should stay at …
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