These are all actions you do with your eyes, but there are some small differences in the ways we use each word:
Look is to direct your attention towards something. “Look” is intentional, and it is often used in the form: look + at + (object)
– Look at the sunset – it’s so beautiful!
– I was looking at all the books, trying to decide which one to buy.
See is to perceive with your eyes, but it is usually not intentional (you don’t “try” to see, it just happens):
– I saw a car accident while driving home from work.
Watch is to keep your eyes on something (usually something that is moving) for a long time. It is intentional.
– I’m watching TV.
– I watched the baseball game.
There are a few details with movies, concerts, etc. We usually say “Have you seen.?” when asking a question about if someone has watched a certain film:
– Have you seen the new James Bond movie?
– Yeah, I saw it yesterday!
– No, I haven’t seen it yet.
Also, we usually use see when going to a movie or show in a theater or public place, and watch when doing it at home:
– Let’s go see a movie at the theater.
– Let’s watch a movie on my laptop.
– I saw Adele live in concert last month.
– I watched Adele’s performance on TV.