"Can't / Cannot you see it?" You can use one of the following: 1. Can't you see it? 2. Can you not see it?

If you don't want to contract it, you should say "Can you not see it?"

"Can't you see it" If you need to find out which form to use (e.g. can't or cannot), search Google for the phrase. It will show the more common one more. For example, I just typed in "cannot you see" and it directed me to results for "can't you see"

It's not possible to begin a question with 'Cannot...?' You can say one of the following: Can't you see it? or Can you not see it? The first is more common in modern everyday English. It follows the same pattern as, for example, 'Aren't you coming ?' or 'Are you not coming?'.