1.Is this a bag?
Yes,it is.
This isn't a bag.
2.Is that my bike?
Yes,it is.
That isn't my bike.
3.Are you a bus driver?
Yes,I am.
You are not a bus driver.
4.Is Mary Green in office?
Yes,she is.
Mary Green isn't in office.
5.Are you English teachers?
Yes,I am.
You are not English teachers.
6.Are Peter's shoes black?
Yes,they are.
Peter's shoes are not black.
7.Are we in the classroom?
Yes,we are.
We are not in the classroom.
8.Are their knives new?
Yes,they are.
Their knives are not new.
By the way.我個(gè)人覺得第五句應(yīng)該有些錯誤吧,原句應(yīng)該是You are a English teacher.這樣吧