英和和英

I had forgotten.

We forgot.

I forgot.

I forgot about it.

I had quite forgotten it―forgotten all about it.

I forgot to say

I'd clean forgotten it.

be buried in oblivion

I remembered.

a thing that is left behind

escape one's remembrance

I remembered it.

I completely forgot it.

to forget

I've totally forgotten.

to forget completely

to forget to turn the light off

I've clean forgotten.

Have you forgotten it?

Forget it.

to be forgotten―pass out of mind―pass out of one's memory―fade from one's memory―escape one's memory―slip one's memory―fall into oblivion―be buried in oblivion

forget to put out ...；forget to turn off ...

impossible to forget

to carelessly forget to say something

I'd forgotten to write it

the state of having forgotten

to forget oneself―lose oneself （in admiration）―be lost （in admiration）―be absorbed （in study）―be engrossed （in one's business）―be beside oneself （with joy or grief）

the condition of being mistaken

I have forgotten all about it.

Never forget it!