Use 'see' to speak about the entire event or experience of watching a film, show, concert, etc. For example:
Have you seen the latest film by Spielberg?
We saw the new play at the Hello Theater last weekend.
Verb Forms: See - Saw - Seen
Use 'watch' to speak about the action of viewing something on TV, online, etc. For example:
Just a moment, I'm watching a video clip on YouTube.
Tom's watching TV, let me get him for you.
Verb Forms: Watch - Watched - Watched - Watching
