一般过去时描述过去状态 — 英语阅读题

Read and answer. My grandpa's old house was small ten years ago. The kitchen was dirty then. The windows were broken, and the floor was old. There was only one bed in the house, and it was hard. The walls were grey and dark. Now the house is different. The kitchen is clean, the windows are new, and there are two soft beds. But one thing is the same: the big tree behind the house. It was tall ten years ago, and it is still tall now. Question: What was the same in grandpa's house ten years ago and now? You may answer in English or Chinese.