1. complete the sentences with the correct form of the verb
to be.
1. they_ cleaning the room when their mother came home from
work. 2.1 sleeping when somebody knocked at the door. 3. we
doing physical exercises at 5 o'clock yesterday. 4. she
playing the piano at this time yesterday. 5. you w atching tv
when your brother came home. 6. yesterday at 10 o'clock in the
evening he sleeping.​

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