This is my pen.（改为否定句）
---This isn't my pen.
Tom is Sue's brother.(改为一般疑问句，并作肯定回答）
---Is Tom Sue's brother?
---Yes,he is.
We are friends.(改为一般疑问句，并作肯定回答）
---Are you friends?
---Yes,we are.
Williams is our teacher.(改为一般疑问句，并作肯定回答）
---Is Williams your teacher?
---Yes,he is.
Is Crisp our teacher.（改为否定句）
---Crisp isn't our teacher.
Is this you ruler?(做否定回答）
---No,it isn't.
Tom and bill are Sandy's friends.(改为否定句）
---Neither Tom nor Bill is Sandy's friends.
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