按要求进行句型转换

　　1. This is a green car. (改为复数形式)

　　  ________  _______ green ____________.

　　2. Mr. Green is a teacher. (改为一般疑问句)

　　  ___________ Mr. Green a teacher?

　　3. They are at home. (改为否定句)

　　  They _________ at home.

　　4. His pen is yellow. (对划线部分提问)

　　  _______________ is his pen?

　　5. Lucy’s clock is on the desk. (对划线部分提问)

____________ _________ Lucy’s clock?