open the brackets While the artist (draw) the picture the children (look) at him. It (snow) hard when they (go) to the mountains to ski. I couldnt go away because it (rain) hard and I (not have) an umbrella

While the artist was drawing the picture the children were looking at him.
It was  snowing hard when they were going to the mountains to ski.
I couldnt go awaybecause it was raining hard and I did not have an umbrella.

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