The baseball is behind the door, not in front of it.

棒球在门后面，不在门前面。

同一单元的其他句子

• Where is my schoolbag? It is under the desk.我的书包在哪里？它在桌子下面。
• Your books are on the chair, not on the table.你的书在椅子上，不在桌子上。
• Is the pencil case in the drawer? Yes, it is.铅笔盒在抽屉里吗？是的，它在。
• Please put your schoolbag on the shelf.请把你的书包放在架子上。
• The keys are in the schoolbag, but my phone is on the bed.钥匙在书包里，但我的手机在床上。