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Regrets:

I wish - If only

In the present

In the past

We use it to talk about a situation in the present that we would like to change

I wish

If only

Wish +

Past Simple

If only +

Past Simple

I wish you liked to play football

If only you liked to play football

We use it to talk about something we would like to change from the past

I wish

If only

Wish +

Past perfect form

If only +

Past perfect form

I wish I had eaten my lunch

If only I had eaten my lunch