to be句型一般疑问句及答语

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？