forget的过去式和过去分词和现在分词

例句：

Neither of us forgot about it.

我俩都没忘记它。

I forgot to ask him for his address.

我忘记向他要地址。

I keep forgetting it's December.

我总是忘了现在是12月份。

Forgetting my notes made me look stupid.

我忘了带笔记，弄得自己像个傻瓜。

I feel awful about forgetting her birthday.

我忘了她的生日，感到很难过。