5. Around me people (not to talk) Russian, Italian and English.weren't talkingwasn't talking​

1. The researcher didn't have to include various significant findings of his observations into the report. 2. At present the surgeon doesn't have to extend his investigations to make a proper conclusion. 3. We don't have to increase the amount of food given to this patient.
1.Does the researcher have to include various significant findings of his observations into the report? 2. Does at present the surgeon have to extend his investigations to make a proper conclusion? 3. Do we have to increase the amount of food given to this patient?