adverbial clause

Not all adverbial clauses are subject subordination, and subject subordination is only used in time adverbial clauses and conditional sentences.

I'll tell him when he comes tomorrow. I'll tell him when he comes tomorrow.

Conditional sentence: If it rains tomorrow, we will stay at home. If it rains tomorrow, we will stay at home.

Subjunctive mood belongs to conditional sentence. The real conditional sentence must be in a declarative tone. (For example, the last sentence)

Subjunctive mood is basically divided into three periods:

1 Complain or guess what happened in the past. If you hadn't gone there, it wouldn't have happened.

If you hadn't gone there, it wouldn't have happened

If I were you, I would go there. If I were you, I would go there.

3. speculate about the future, for example: what shall we do if there is no water on the earth tomorrow? What shall we do if there is no water on the earth tomorrow?