This is a video that explains how to make wishes

A WISH THAT CAN COME TRUE
We use wish followed by an infinitive clause to express a wish that can occur in the future. (A that-clause may follow hope or wish.)
SUBJECT	VERB	COMPLEMENT
We	wish	to go with you. (direct request / demand)
We	would like	to go with you. (more formal request)
I	hope	(that) we can go with you. (suggestion / request)
I	wish	*(that) I can go with you.

AN IMAGINARY WISH
We use wish + preterit to express a wish about a hypothetical (imaginary) situation. Optionally, use that before the clause that complements the verb.
SUBJECT	VERB	COMPLEMENT
I	wish	(that) I were¹ home in my country. (a private thought; a longing)
I	wish	(that) I could go with you. (an excuse due to inability, or an expression of regret)
I	wish	(that) you would let me pay for dinner.(pretend regret, or upset)
I	wish	(that) you would turn that TV off! (low expectation request; anger, outrage)

preterit – the past tense verb form

was (informal) / were (formal) If I was / were… preterit verb form. Irrealis (Huddleston 3 §1.7)

*a that-clause is not used for a present (real) wish

Unreal Wishes (Hypothetical)

Present and Past

A PRESENT WISH ABOUT THE PAST
Wish followed by a clause with could have or would have expresses regret about a past action that did not happen.
SUBJECT	VERB	COMPLEMENT
I	wish	(that) I could have gone with you. (regret over a lost opportunity)
I	wish	(that) you would have remembered to take the dog out. (nagging, anger)

A PAST WISH ABOUT THE PAST
Wished follwed by a clause with could have, would have, or a past participleexpresses regret about a past action that did not happen.
SUBJECT	VERB	COMPLEMENT
I	wished	(that) I could have gone with you. (remembering a lost opportunity)
I	wished	(that) I had been old enough to drive. (remembering a wish)

And now that you understand how to make wishes you can practice here wishes