It would be nice/good if it didn't rains yesterday.
It would be nice/good 是固定句型搭配，意为。。。。很好、就好了
句子意思是如果没下雨就好了，事实上是已经下了，这是代表说话者的愿望。
过去发生的用did ,没有就是didn't.而would be 代表的是虚拟语气，代表的是主观者的主观想法。
翻译：It wouldn't have been better if it didn't rain yesterday.
要是昨天没下雨就好了
If it did not rain like yesterday
if only it didn't rain yesterday.
If it didn't rain
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