1. This is for someone spacial,you see. 2. this is for someone spacial, which you see. 3. you see this is for someone spacial. all of the sentences above are correct or not and which one is more useful.
NOT A TEACHER.
Assuming that you mean "special," I'd say that the first two sentences are correct, while the third lacks a comma after "see."
This is for someone special, you see = You are explaining to someone that "this" is for a special individual
This is for someone special, which you see = Again, you're explaining to someone that "this" is for a special individual, and the person you're explaining it to sees (i.e., understands) this
You see, this is for someone special = See no. 1 (Maybe there should be a "semicolon" after "see," although I doubt it because I think "You see" is an interjection.)
The second sentence is somewhat unlikely to be said/written, and it has a different meaning from the other two.