This is your computer?如何改为一般疑问句

This is your computer?如何改为一般疑问句 This is a computer.(改为一般疑问句) This is my computer.改为一般疑问句 This is your conputer.如何改为一般疑问句 This is your pencil.(改为一般疑问句) This is your computer game 改成一般疑问句 This is your pencil sharpener.改为一般疑问句 This is your blue skirt.（改为一般疑问句） This is your ice cream（改为一般疑问句） This computer is mine改为疑问句 This is an ID card 如何改为一般疑问句 This　is　a　telephone．如何改为一般疑问句