⑴A: What's in my bag? B: An English book and a Chinese book.
⑵A: Who's this? B: This is my grandmother.
⑶A: Hi, Peter. Is this your uniform? B: Hmm, no. That's my uniform.
⑷A: Hi, Yang Ming. This is my brother, Sam. B: Hello, Sam!
⑸A: Good morning, Robot! B: Good morning!
