| A．Keep to the right! | B．Keep your desk clean. |
| A．Anything else? | B．Of course. |
| A．Keep your desk clean! | B．Keep your clothes clean! |
| A．Talk quietly! | B．No drinking! |
| A．No talking! | B．No eating! |
| A．The monkeys plays on the hill. |
| B．The monkey is playing. |
| C．The monkeys are playing. |
| A．Do you watch TV? | B．Are you watching TV? | C．Is it a TV? |
| A．Yes, I am. | B．No, I’m not. | C．Yes, it is. |
| A．Talk quietly. | B．Take turns. | C．Keep your desk clean. |
| A．Don’t speak loudly in the classroom! |
| B．Keep quiet in the library. |
| C．Don’t talk in the library! |
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