This is my new shirt改为否定句

This is my new shirt改为否定句 This is my shirt.(变为一般否定句） This is my ruler (改为否定句) This is my room 改为否定句 this is my friend.(改为否定句) this is my brother 改为否定句 This is my father()改为否定句 This is my grandmorther.改为否定句 This is my siste 改为否定句 This is my watch改为否定句 This is my shirt.改为复数句怎么改 This is my friend This ( )( )my friend(改为否定句)