四、根据对话内容，在表格中打“√”。
Miss White: Hello, boys and girls! Let's play games. There are some things in my box. Guess! Whose books are these?
Lucy: Are these Oliver's?
Miss White: Yes, they are his. Whose ruler is this?
John: Is it Cindy's?
Cindy: Yes, it's mine.
Miss White: Look! What a beautiful hat! Whose is it?
Oliver: It's John's.
Miss White: Oh, yes! It's his.
| | Lucy | John | Cindy | Oliver |
| ---- | ---- | ---- | ---- | ---- |
| books | | | | |
| ruler | | | | |
| hat | | | | |

books这一行在Oliver对应的格子打√，ruler这一行在Cindy对应的格子打√，hat这一行在John对应的格子打√，其余所有格子都不打√。

我们逐句对照对话内容确定每件物品的归属：
1. 从对话中"Whose books are these?...Yes, they are his."能得知书是Oliver的；
2. 从对话中"Whose ruler is this?...Yes, it's mine."能得知尺子是Cindy的；
3. 从对话中"Whose is it?...Oh, yes! It's his."能得知帽子是John的，全文没有提到物品属于Lucy，Lucy对应的所有格子都不需要打勾。