用be动词适当形式填空。
1. I  ____ an English teacher now.   
2. She ____ happy yesterday. 
3. They ___ glad to see each other last month.  
4. Helen and Nancy _____   good friends.   
5. Look, there ____ lots of grapes here.   
6. There ___a sign on the chair on Monday.

找出错误并改正：What are your favourite colour? ______________

Everyone ____ to their teacher in the classroom. （ ）

A．are listening

B．is listening

C．listen

He ______ old. (   )

A．am

B．is

C．are

Who   first? (  )

A．were

B．was

C．are