To choose is to decide. There’s a situation in which more than one other option is possible. The word "choose" is similar to "pick" or "pick out." This is an irregular verb.
simple
past
past participle
choose
chose
chosen
Sophia chose to live in the United States.
Bernie is choosing furniture for his new apartment. (He’s picking out furniture.)
What color did you choose to paint your living room?
I’ve chosen not to work any extra hours this summer.
It’s important to choose a good college. (In this sentence, "choose" is an infinitive.)
There are many different schools to choose from.
My friend Vanessa chose to become a vegetarian.
Choosing a career is difficult for some people. (In this sentence, "choosing" is a gerund.)
This market has a lot of good produce to choose from.
The word "choice" is a noun.
They have many good choices.
What kind of choices are there on the menu?
This is a difficult choice.
He has no choice but to move back to Argentina.
That car gets good gas mileage. You’ve made a good choice.
The words "choosy" and "chosen" are adjectives:
Don’t be so choosy in picking a place to eat.
He’s too choosy when it comes to women. (It’s hard for him to find the right person to date.)
Denise finally found a job in her chosen profession.
The chosen candidate goes on to the general election.