This is a key改为一般疑问句?

This is a key改为一般疑问句? This is my key.改为一般疑问句! this is his key 改为一般疑问句 This is a clock.(改为一般疑问句) This is a boy.改为一般疑问句 This is a computer.(改为一般疑问句) This is a ruler 改为一般疑问句 This is a ruler改为一般疑问句 This is a desk.(改为一般疑问句) This is a pen.改为一般疑问句 This is a map 改为一般疑问句 This is a camera.(改为一般疑问句)