Раскрыть скопки 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.