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1.I (draw), when my mum (call me)
2.Suddenly he (see) a big black dog. It (sit) at the door of his house

1.I was drawing, when my mum called me. 2.Suddenly he saw a big black dog. It was sitting at the door of his house.

I was drawinng,when my mother called me.Suddenly he saw a big black dog.It was sitting at the door of the house.