在句子'如果你来，我们就开始'中，'如果你来'是一个从句。

In the sentence 'If you come, we will start,' 'If you come' is a ___sub-clause.

虽然天晴了，但地面还是湿的，因为从句‘之前下过雨’解释了原因。

Although it's sunny now, the ground is still wet, as the ___sub-clause 'it had rained earlier' explains why.