Ответ:
1. The patient wasn't able to fall asleep after taking the medicine. Was the patient able to fall asleep after taking the medicine.
2. We didn't have to analyze his work. Did we have to analyze his work?
3. The pulse rate wasn't accelerated. Was the pulse rate accelerated?
4. The patient didn't complain of the pain in the chest. Did the patient complain of the pain in the chest?