The twins are twelve years old.否定句

The twins are twelve years old.否定句 The twins are twelve years old.Betty is eleven years old.(变为 The twins are 12 years old.Kate is 13 years old.(合并为一句) Kate The twins are twelve.Kate is eleven. Peter is twelve years old 同义句 The twins are doing their homework.(否定句） Both of the twins are good at singing(否定句) The twins are twelve.kate is elven.改为同义句Kate()the()of(). The twins are twelve.Kate is eleven.(改为同义句） Kate ____ the __ they are both eleven years old.(改为否定句)_____________them_____ The twins are twelve.Kate is eleven.（改为同义句）,怎么改? 1.The twins are twelve.Kate is eleven.（改为同意句）