If I had a lot of money, I would travel around the world.
correct
If I would have a car, I would drive to school.
incorrect
If she were taller, she would play basketball.
correct
If he studied harder, he would pass the exam.
correct
If we had a robot, it will do our homework.
icorrect
If he meets an alien, he would be very scared.
icorrect
If they won the lottery, they would buy a big house.
correct
If we lived near the sea, we would go swimming every day.
correct