inquire into (?.)

• comment upon
• criticize
• deal with
• descant
• discourse
• discuss
• dissert
• dissertate
• entertain
• go into
• handle
• investigate
• look into
• probe
• prospect
• remark upon
• review
• see about
• sift
• sleep upon
• survey
• take under advisement
• take under consideration
• take up
• think it over
• touch upon
• treat
• treat of
• write up