Undecided questions
What difference si there between "watch" and "see"? Are they always interchangeable?

To see something is to view it, more casual and unintentional. Such as did you see that bird fly by?

'Watch' is done with intent, you are watching that person/ object on purpose. "Such as i watched her while she walked past me" or "I watched the television".

Watch - look forward
see - receive visual information

The difference between "see" and "watch" is that we normally "watch" something that occurs over a period of time, as opposed to "see". We watch athletic events, for example. We watch television. "Watch what happens when I light the fuse".