I wish they returned before Christmas.
The student wished he had studied the material better and shown better knowledge at the exam.
I wish you had sent for us last night.
I wish you were with us these days.
I wish you knew enough physics.
He wished he had had enough time to finish his paper.
I wish we were able to reach home before teatime.
I wish I had not made you upset by telling you this news.
My friend wishes he had gone to university.
My friend wishes he had entered the university.