Allowed to

Last year Tim (a)   have a birthday party. (-)

I (a)   watch TV until 10 p.m. (+)

Suzie (a)   go to the disco next year (+).

John (a)   play the piano at night (-).

When grandma was young, she (a)   wear trousers at school (-).

We (a)   sleep in a tent last Saturday (+).

(a)   (you) stay up until 10 p.m.?

You (a)   use mobile phones in hospitals or planes (-).

After the body had been found, nobody (a)   leave the crime scene (+).

Tony and Rick (a)   ride their bikes to school (-).