Is this sentence correct ? I put the glass back on . ?

Answer 1

If you mean "Put on" as in "don'" or "wear", no one wears a glass so the sentence is nonsense.  If you mean put on as in place upon, you have to actually say where it is that the thing is put.

Answer 2

Recognizing this is incomplete since it doesn't indicate where the glass was put, it is correct as far as it goes.

Answer 3

Are you talking about a drinking glass? OR glasses that you wear to see better.

I put the glass back on the shelf where it came from.

I put my glasses back on. 

Answer 4

If you had been wearing a hat, but took it off, then later put it back on, yes, you could say "I put the hat back on".

But not in any other sense. You would have to say WHAT you put the glass back ON.

I put the glass back on the table.She put her book back on the shelf.

Answer 5

I put the glass back on the table, or similar, would work

Answer 6

No one can answer you unless  you write the FULL sentence.