Make sentences with wish if only for these situations:
You aren't very good at singing.
You argued with your parents last night.
You don't have any friends abroad.
Your ears are too big.
You didn't pay attention in the maths lesson.
You don't understand your maths homework

I wish I were very good at singing.I wish I had not argued with my parents last night.I wish I had friends abroad.I wish my ears were not too big.If only I had paid attention in the maths lesson.If only I understood my maths homework