5. Only when they had finished eating, did they get ground to business.

6. Only after waiting for 20 hours, did they fly

7. Only if we use force, could the door be opened.

8. Only with Tom's apologize, will I agree.

9. Only with training hard every day, can you become a good athlete.

5.They didnot get ground to business until they had finished eating.

=> Only until they had finished eating did they get around to business.

6. They had to wait for twenty hours before they flight after

=> Only after they had waited for 12 hours did their flight leave.

7. The door could not be opend without using forse

=> Only using force could the door be opened.

8.I wont agree until Tom's apologized

=> Only until Tom's apologized will I agree.

9. The only way you can become a good athlete is by training hard everyday

=> Only by training hard every day can you become a good athlete.