forget的過(guò)去式和過(guò)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(guò)了頭。

　　I am sorry that I forgot to buy the milk.

　　對(duì)不起，我忘了買(mǎi)牛奶。

　　He forgot the charger for his mobile phone.

　　他忘了帶手機(jī)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(méi)忘記沃爾特斯博士吧？