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1. They aren't listening to music.
2. We're eating dinner at home.
3. She's playing tennis in the park.
4. We aren't studying snakes at school.
5. You aren't writing an email in English.
6. They're visiting some friends.
7. He isn't looking at the teacher.

they are not listening to music ~

we are  eating  dinner at home v'

she is playing tennis in the park ./

we are not  studying snakes at school x

you are not writing an email in English ~

they are visiting some friends ./

he is not looking at the teacher ~