Correct: I was returning home when it started to rain., We were cooking a cake while you were sleeping., The birds were singing and my friend was listening to them., We were making our beds while our mother was cooking breakfast., They were building the house and the sun was shining., Incorrect: You were walking in the park when it was snowing., The cats were playing ball while the dog were eating., Bob was doing his homework while his mother came into the room., I was listen to music when the phone rang., When I was going home, my brother was sleeping.,

Past Continuous/Simple - when/while

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