hello please help me I don't know English

Answer:
2. If Tom doesn't work harder, he will not pass his exams.
3. If Jim and Kath buy a new car, they'll drive to Spain next week.
4. If we don't go to the supermarket, we won't have any food for supper.
5. If my sister reads your letter, she would be very upset.
Explanation: I hope I helped! If I didn't, please don't attack me! :(
Answer:
2. If Tom does not work harder, he will not pass his exams.
3. If Jim and Kath buy a new car, they can drive to Spain next weekend.
4. If we do not go to the supermarket, we will not have any food for supper.
5. If my sister would have read your letter, she would be very upset.
Hope it helps and have a great day! =D
~sunshine~