3. Read, look and correct.

This is my room. My hat is on the bed. My shoes are under the bed. My books are on the desk. My toy bear is on the sofa. My bag is on the chair. My glasses are on the shelf. My coat is on the wall.

3. 文中错误依次为：
on the bed 改为 on the desk（或根据图可改为 on the bed 附近合理位置，图里帽子在床上可保留 on the bed 表述正确不修改，这里按文本与图对比，主要找明显错误，鞋在床下 “under the bed” 正确，书在桌上 “on the desk” 正确，玩具熊在地上 “on the sofa” 错误应改为 on the floor，包在地上 “on the chair” 错误应改为 on the floor，眼镜在架子上 “on the shelf” 正确，外套在门上 “on the wall” 错误应改为 on the door）
Corrected: This is my room. My hat is on the bed. My shoes are under the bed. My books are on the desk. My toy bear is on the floor. My bag is on the floor. My glasses are on the shelf. My coat is on the door.
3) over there
4) your T - shirt