You’ll feel better after you take the pills. 吃完药丸后你会感到好一些。The police learned that he wasn’t there at that time. 警察获知他那时不在场。
这两句都是复合句,第一句的主句是You’ll feel better,从句是after you take the pills,由after引导,在整个复合句中用作状语,表示时间;第二句的主句是The police learned是主句,that he wasn’t there at that time是从句,由that引导,在整个复合句中用作宾语。