复合句的主句和从句也和简单句一样，必须有主语和谓语。

The main clause and subordinate clause of compound sentence must have subject and predicate, as same as the simple sentence.

youdao

复合句的主句和从句也和简单句一样，必须有主语和谓语。

The main clause and subordinate clause of compound sentence must have subject and predicate as same as the simple sentence.

youdao

当我进来时，他在听收音机。（主句和从句的动作同时发生。）

He was listening to the radio when I came in.

youdao