I forgot to pick up my dry cleaning! 我忘了要去洗衣店拿衣服。

　　I just forget to return his call. 我忘给他回电话了。

　　Excuse me? You forgot to give me my receipt. 打扰一下，你忘了给我收据了。

　　Why didn't you prepare a report? 你为什么没写报告？

　　It's my fault. I forgot to do it. 是我的错，我忘了。