wish, if only, should

use:

- wish + past simple

to talk about things you would like to be different in the present/future (but which are impossible or unlikely

- wish + person/thing + would + infinitive to talk about things we want to happen, or stop happening because they annoy us

(You can't use would for wish about yourself. eg. NOT I wish I would....)

- wish + past perfect  to talk about things that happened or didn't happen in the past and which you now regret.

You can also use If only instead of I wish with these teneses.

- should + have + past participle