1.The number of the people who lost homes reached as many as 250,000. 2. We saw the boy who is John's brother yesterday. 3.It sounded like a train what was going under my house. 4.My father has just bought the car what was destroyed in the earthquake. 5.The earthquake was the biggest in American history what shook the city in 1996. 你就按着这个格式造吧。是定语从句的考察点。