The clue word "however" almost always indicates a "contrast". This is because when using this word, the writer can on one hand agree with what he or she is saying, but offer a different point of view to be considered.
Answer: test them and find out and if you’re wondering if you can trust someone to begin with, then you probably can’t
Present=existing or occurring now
past=occured previously
Answer: Fragment
Reason why- the sentence only has a subject and a verb, not all the details needed for a sentence
