If we had known how to help we would have acted.
假如我们知道如何做是有效地，那么我们就会采取行动。
If we had known how to help, we would have acted.
如果我们知道要如何应对，我们将立即行动。
If we had known how to help, we would have acted.
如果我们知道如何去帮，就一定会采取行动。
If we had known how to help, we would have acted.
如果我们知道如何做是有效的，那么我们就会采取行动。
If we had known how to help, we would have acted.
如果我们知道如何做是有效的，那么我们就会采取行动。
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