This is a bus.（改为一般疑问句）

This is a bus.（改为一般疑问句） Is this a bus （改为复数句 This is a bus.改为复数. he is sitting in a bus.改为一般疑问句 This is a bus.改为复数形式的句子 this is a bus.把它改为复数句 1.this is a bus（改为复数句子） This is a bus 改为单数或则复数 this is a bus.(改为否定句） This is a desk.(改为一般疑问句) This is a ruler 改为一般疑问句 this is a pencil 改为一般疑问句 This is a computer.(改为一般疑问句) This is a pen.改为一般疑问句 This is a key改为一般疑问句? This is a ruler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)