Joanna:We have a new classmate tomorrow. Her name is Vivian.
Daniel:Really? What’s she like? Is she tall?
Joanna:No, she isn’t. She is short.
Daniel:Is she friendly?
Joanna:Yes, she is. She is very nice.
Daniel:That’s great!
Teacher:Molly, 刚刚Joanna和Daniel的对话中出现了这样几个句子,你观察下它们有什么共同点没?