把下列两个简单句子变成含有定语从句的复合句:

把下列两个简单句子变成含有定语从句的复合句:
1.She`s the lady.I served the lady yesterday.
2.Miss Lee is the teacher.The teacher`s house caught fire last week.
3.There are thousands of stars in the sky.The stars are like our sun.
4.I once lived in the house.The house`s roof has fallen in.