Student or Learner
I'm a little bit confused as to what this sentence means:
It is possible that he must have used it already.
Why is the word "possible" used in the sentence when the other part of the sentence already expresses possibility.
Is it redundant? Can you reword it for me in a different sentence?
Shouldn't it be:
It is possible that he used it already. (Is this better? Does it have a similar meaning? What's the difference?)
More seriously, 'It is possible that he used it already' expresses less certainty than 'He must have used it already'. Use whichever is appropriate. Don't just mix the two together (as in your first example sentence) because you're not sure which one to choose.