In the following sentences, there is probably an aspectual error.
Wouldn't that error rather be in:
'I wish I went to the party, which I had been invited to last week.'
than
'I wish I had gone to the party, which I had been invited to last
week.'
?
For me, "I wish I had gone…" absolutely fits in, making the order of events perfectly correct and suitable.
Note: The only reason I have made this OP is because my professor, who is NOT a native English speaker, claims the opposite. He probably mistook subjunctive [mood] meaning for the literal meaning of the past.
Best Answer
Those are conditional sentences. The first one is not correct. It’s the second conditional sentence kind, which means that the use of ‘wish’ and a simple past verb expresses a desire that could come true in the future.
The second sentence is the third conditional sentence kind, it’s constructed using ‘wish’+ ‘had’/‘had not’ + past participle verb, and expresses regrets or past wishes.
It’s common for people to use them the wrong way.