i wish i were or i wish i was ?

It should be '' I were '' .

note: subjunctive mood

wish + simple past tense = past subjunctive

* we have to use ''were'' instead of ''was'' for all person.

I wish I were
根據我地學既英文睇係I wish I was因為I 係跟was
但係根據文法係應該I wish I were
因為呢句既意思係"我真希望我係/我在.."
即係你係冇做到呢件事,只係覺得我做左就好喇
面對呢d冇可能發生既situation, I就跟were

肯定係 i wish i were

"i wish i was"
present tense is "i wish i am"
"am"的past tense is "was"
so ,
"i wish i was" is correct.

neither
i wish i were
nor
i wish i was!

is I wish I was!

I wish I was.
因為'I'用'was'