Apart from the difference between forget it and forget about it, what do you forget and what do you forget about?
Do you forget a face, someone's birthday or your date who is waiting for you?
Do you forget about your keys or the money you borrowed your friend? What are the criteria for which is/are acceptable?
In the M-W Learner's Dictionary is found the following, by Peter Sokolowski:
[W]hat's the difference between forget and forget about?
Forget about is used with a couple specific senses of forget. In the following senses, the use of about is optional.
When forget is used to mean "to stop thinking or caring about (someone)":
- He was once a famous actor, but now most people have forgotten (about) him.
- You shouldn't forget (about) your old friends.
When forget is used to mean "to stop thinking or caring about (something) on purpose":
- We need to forget (about) our differences and learn to get along.
- “I'm sorry I'm late.” “That's OK. Forget (about) it.” [=don't worry about it]
- Forget about finding a way to escape—there's no way out of here.
- I had almost forgotten about my car accident last year.
About can add some emphasis when something specific is forgotten, but sometimes the structure of the sentence changes:
- I forgot to pay the bill. = I forgot about paying the bill.
But can anyone add other details to the different usages?