You just forgot that I told you this? 你忘了我跟你说的事情了？

　　You forgot that you had that suitcase? 你忘了你有那个箱子？

　　I can't believe it! I forgot you were here. 我简直不敢相信，我忘记了你曾在这儿了。

　　Forget I said anything. 不用在意我说的话。

　　I'll be going to New York in December. 我会在12月去纽约。

　　Many people forget that it's cold there in the winter. 很多人都忘了，那时候的纽约非常寒冷。