it must have rained last night信息详情
昨晚一定下雨了
last night───adv.昨晚
rained───下雨（rain的过去式）
last night mouse───昨晚老鼠
last night study───昨晚学习
must have to───一定要
must have done───必定做了…（表示对过去的推测）
it must be───它必须是；一定是
must do it───我必须这么做
must───n.(Must)（美）穆斯特（人名）；n.绝对必要的事物；待发酵的葡萄汁；发霉，潮气；aux.必须；一定；应该，得
The road was muddy. It must have rained last night.───道路是泥泞的，昨天晚上一定下过雨了。
The ground is wet,it must have rained last night.───地面是湿的，昨晚肯定下雨了。
must have rained last night.───昨天晚上肯定下雨了。
It must have rained last night, for the road is all wet.───昨晚准是下雨了，道路都湿了。
It must have rained last night for the ground is all wet.───昨天夜里一定下过雨，因为现在地面全湿了。
so, for. It must have rained last night for it is wet all over.───昨晚一定下雨了，到处都这么湿。
It must have rained last night, for the ground is still wet.───昨晚一定下雨了，地面还是潮湿的呢。
Since the road is wet, it must have rained last night.───既然路是湿的，那昨天晚上肯定下雨了。
It must have rained last night, for the ground is covered with water.───昨晚一定下过雨，因为底上到处都是水。