We use this structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." when there is a chance that something may happen or somebody (but not the person who wishes) may change their (perhaps annoying) habit or behaviour.

I wish it would stop snowing.
I wish you wouldn’t keep coming to class late.
Jean wishes I would give up smoking.

wish/if only + subject + past perfect

wish/if only + subject + past tense

If only I could talk to her! = I wish I could talk to her!

Note the similarity between the subordinate clauseA clause that cannot be a sentence in itself. It is joined with a main clause. E.g.: I wouldn’t go there if I were you. ("if I were you") When I arrived he was surfing. ("when I arrived") of the second conditional and the one mentioned above. Actually, if you complete the sentences above, you will get a second conditional sentence.