ascertain (v.)

• appraise
• ask
• assure
• certify
• cinch
• clinch
• consider
• contemplate
• decide
• demonstrate
• determine
• discover
• ensure
• establish
• find
• fix
• follow
• get
• hear
• inquire
• inspect
• insure
• interrogate
• learn
• observe
• prove
• query
• question
• reassure
• resolve
• see
• settle
• show
• study
• survey
• tumble
• unearth
• view
• weigh