将下面的句子排列成对话，然后仿做类似的对话。

□Is Alice your sister?

□And is Tom your brother?

1 Who are they?

□No, he isn't. He is my friend.

□Yes, she is.

□That is Alice and that is Tom.

写出be的正确形式填空.

Your sister and I ________ in the room.

写出be的正确形式填空.

Your sister and I ________ in the room.

---- Where are your family, Bob?

----- My mother is at home. My father is at school. My sister and I ____ in the school library.

A is           B am            C are          D be