句型转换。
This is Tom’s bike.(就画线部分提问)
_______ bike is this?
This book is Mary’s.(改为同义句)
This book ________ _________ Mary.
Tina can sing. She can dance.(合为一句话)
Tina can ______ _______ sing _______ ______ dance.
Healthy lifestyle can prevent children from catching common diseases.(改为同义句)
Healthy lifestyle can ______ children _______catching common diseases.
He must be at work at the moment.(改为否定句)
He_______ be at work at the moment.