This is the 428th most frequent Chinese word.
忘
"Forget"
忘 is used here to indicate forgetting to do something specific.
我忘了带钥匙。
I forgot to bring the keys.
忘 is used here to highlight habitual action or tendency of forgetting.
他总是忘记别人的生日。
He always forgets others' birthdays.
忘 is employed to stress the importance of remembering something.