Hi Teo Though I myself am an English learner, I feel all the sentences are correct. "You see something" is "the thing comes into your sight" and "you look at something" is "you direct your sight toward the thing". And "you watch something" is "you keep attentively looking at the thing".
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Paco2004 "You see something" is "the thing comes into your sight"Generally, I like your notion of three actions, Paco, and I think it is useful to distinguish between the various words we want to use for our visual functions.
Rishonly Is it grammatically correct to say "maybe carries.." or "maybe adds.."? ,or are they just typos?Well, Rishonly, I can say they're not typos.