If
She doesn't know if she'll travel because she doesn't know if she'll have money.
If she has money, she'll travel.
I'm not sure if I'll buy that car, it depends if it's a good deal.
I won't buy that car unless it's a good deal.
Mary's too short to be a model.
She wishes she were taller.
Bob doesn't save money, so he isn't able to buy a car.
If he saved money, he would be able to buy a car.
Jane is rich, so she spends a lot of money.
Jane wouldn't spend a lot of money unless she were rich.
Sam can't ride a bike.
He wishes he could ride a bike.
Bill is too ugly so he isn't able to get a date.
If he weren't so ugly, he would be able to get a date.
Will has many friends, so he's very busy.
He wouldn't be so busy unless he had many friends.
Janet was sick, so she missed class.
She wishes she hadn't been sick.
Pat learned English, so she went to the States.
If she hadn't learned English, she wouldn't have gone to the States.
Charles studied hard, so he passed the test.
He wouldn't have passed the test unless he had studied hard.
Peter spent all his money and now he can't afford to travel.
He wishes he hadn't spent all his money.
Anne didn't go to the concert because she wasn't able to buy her ticket.
If she had been able to buy her ticket, she would have gone to the concert.
I drove over a huge nail and I got a flat tire.
I wouldn't have gotten a flat tire unless I had driven over a huge nail.
Chloe was sick during her vacation.
She wishes she hadn't been sick.