1. She said that she would leave there the following week (here)
--> she said :" I will leave here next week ".
2. The garage is going to repair the car for us next week(repaired)
--> We are going to have the car repaired by the garage next week
3. Because Nam didn't know how to solve the maths problem, he didn't got high marks (known)
--> If Nam had known how to solve the maths problem, he would have got high marks
4. I didn't win the lottery in the past so I am not rich now (won)
--> If I had won the lottery in the past, I would be rich now
5. I think you should pay attention to the lesson in class (you)
--> if I were you, I would pay attention to the lesson