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1) When I (come) into her room she (see) her son (play) with a ball which she (buy) in the shop
2) His brother (be) taken to the hospital because he (have) an accident
3) Mary (bring) him a glass of water as he (ask) her about it

1. When I came into her room she saw her son playing with a ball which she had bought in a shop2. His brother was taken to the hospital because he had an accident3. Mary brought him a glass of water as he asked her about it