Put the verbs in brackets in to Present Simple, Past Simple, Present Continuous, Past Continuous. First sentence is done for you.

1 Aiman is a shop assistant. She usually ___________________ (work) at night.
2 “What is that noise?” Aidar ______________________(repair) his car at the moment.
3“________________ (be) you busy?” “No, I am not.”
4My sister _____________ (enter) to the university when she was 17.
5. They __________________ (sing) while we ______________(play) some music