When you "file" something, you either submit (give) paperwork to a government agency, or you organize and store paper and important documents. This first set of sentences and questions shows how to use the word "file" as a verb.
Have you filed your income taxes yet?
If you don’t file your income taxes before April 15, you’ll have to pay a penalty.
We need to file a complaint with the police about people speeding in our neighborhood.
Amina is going to file a lawsuit against her supervisor for harassing her at work.
I file everything alphabetically in my file cabinet.
Mary has to file some important paperwork that she’ll need at a later date.
You can also use "file" as a noun:
There are several files on Bob’s desk.
The file that the police have on the suspect is several inches thick.
She’s putting a file into the file cabinet.
A "file" is also a tool or a device used for smoothing out a hard surface.
The repairman used a file to remove some rough spots on a piece of metal.
Rhonda uses a nail file when she takes care of her fingernails.