forget的過去式和過去分詞是什么啊?

　　例句：

　　I forgot to set my alarm and I overslept.

　　我忘了上鬧鐘，所以睡過了頭。

　　I am sorry that I forgot to buy the milk.

　　對不起，我忘了買牛奶。

　　He forgot the charger for his mobile phone.

　　他忘了帶手機充電器。

　　I've completely forgotten her name.

　　我完全把她的名字給忘了。

　　I've forgotten where they live exactly.

　　我忘記了他們的確切住址。

　　You surely haven't forgotten Dr. Walters?

　　你肯定還沒忘記沃爾特斯博士吧？