Answer:
I didn't do the homework.
If only I had done the homework.
They have committed a crime and now they have to face justice.
They wish they hadn't committed a crime because they must face the consequences.
This kid is so stubborn.
I wish that this kid wasn't so stubborn.
He never does any household chores. I'm sick and tired of it.
I wish he did some household chores; I'm annoyed that he doesn't.
Jason doesn't pay much attention in class.
If only Jason paid more attention in class.
Why doesn't he stop smoking? There are other people in the room who don't smoke.
If only he stopped smoking- it'd make everyone else more comfortable.
I've got a splitting headache.
I wish that I didn't have a splitting headache.
He signed the contract without reading the small print.
He wishes that he read the small print before signing the contract.
Steve didn't propose to Isabel when he should have. Now Isabel is in Australia.
Steve wishes that he proposed to Isabel earlier.
She was told off because she didn't do what her mother had asked her.
She wishes she had done what her mother had asked her.
He always belches loudly after eating. It's such a disgusting habit.
I wish he didn't burp loudly after eating.
She didn't heed my warnings. That's why she lost everything.
If only she had listened to my warnings.
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Good luck! I hope I did this right for you. :)
