1. yesterday i (go shopping) 2. while i (walk) home i suddenly (feel) an awful pain in my back. 3. he (go) to the doctor three times already this week. 4. julia (be) ill since she (come) back from england last week. 5. when i (arrive) christine.

1. yesterday I ... (went shopping)
2. while I ... (was walking) home I suddenly ... (felt) an awful pain in my back.
3. He ... (has gone) to the doctor three times already this week.
4. Julia ... (has been) ill since she ... (came) back from England last week.
5. When I ... (arrived) Christine как будто предложение не дописано, смысл непонятен