forget

forget + noun
I forgot the address.

forget + pronoun
Don’t forget him.

forget + about + noun
I almost forgot about the meeting.

forget + to + base form
Don’t forget to turn off the lights.

forget + clause
I forgot I had an appointment at 3 p.m.

forget + that + clause
I forgot that I had an appointment at 3 p.m.

forget + wh- clause
I forget how much I paid for that.