忘記的英文單詞是forget。

forget的用法是：

1、forget to do表示忘記還沒做的事情，例如I am sorry I forgot to return the library book，意思是對不起，我忘記歸還圖書館的書了。

2、forget doing表示忘記已經(jīng)做過的事情，例如He forgot going to Shanghai with his parents when he was five years old，意思是他忘記了五歲時曾跟父母去過上海。

3、forget that表示從句，例如Never forget that you are loved，意思是永遠不要忘記你所愛的人。