Rewrite the sentences

1 . " You had better study harder for your exam" he said
2. " Give me your suitcase or I will kill you," they said to me 
3. " Remember to lock the door," she said to me
4. " You ought to read the question carefully," she said to me
5. " Don't put your hand on the oven. It's hot, " she said to me
6. " Take the medicine every night, " the docter said to her
7. " I will punish you if you don't go home on time, " he said
8. " You shouldn't buy this house, " he said to her