| A．What's wrong? |
| B．What do you do? |
| A．I have a toothache. |
| B．I have a stomachache. |
| A．I played games on the computer yesterday. |
| B．I worked on the computer yesterday. |
| A．You shouldn't play computer games on weekends. |
| B．You shouldn't play computer games before doing your homework. |
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