I deduce from the given evidence
From his findings on the Galapagos Islands, Charles Darwin was able to deduce that isolation contributed to evolution. .
I can deduce by that grin on your face and your hands behind your back that you have a gift for me.
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).
The investigators were able to deduce that the suspect must be a young person because of evidence found at the crime scene.