The subjunctive and wish

After verbs of demand and advice, formal English uses the base form for every person: they insisted that he leave, it is essential that she be on time, I suggest that he see a doctor.

Wish moves the tense back. A present wish takes the past: I wish I had more time, I wish I were taller. A past regret takes the past perfect: I wish I had studied harder.

To complain about what someone keeps doing, use would: I wish you would stop talking. If only works like wish, with more feeling: if only I had listened.