When should I use "look", "see", and "watch"?
I'm watching "Star Trek".
Have you seen "Star Trek"?
Are the examples above correct?
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Here are some simple rules that will help deciding which word to use:
See is used as inactive word; you just see without any effort:
Look is used as active word, you make an effort to see:
Watch is also an active word; you also make an effort, but it is for a longer period of time:
Here's an example demonstrating the difference:
I'm looking, but I don't see it.
Back to examples:
I'm watching "Star Trek" — it is a continuous action;
Have you seen "Star Trek"? — it is a question if you ever seen it at all, or do you know about it;
It can be also formulated: Have you watched "Star Trek" all night?, and it will mean that you have spent all night watching a movie.