1. We didn’t visit her because we didn’t have time.
=> If we had time, We would visit her
2. Jill is very rich, so he can buy anything he likes.
=> If Jill is very rich, he will buy anything he likes.
3. She is lazy, so she can’t pass the exam.
=> if She is lazy, she will pass the exam.
4. Susan felt sick, because she ate 4 cream cakes.
=> If she hadn't ate 4 cream cakes, Susan wouldn;t sick.