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IV. Make the sentences negative and interrogative:
1. The researcher had to include various significant findings of his observations into the report. 2. At present the surgeon has to extend his investigations to make a proper conclusion. 3. We have to increase the amount of food given to this patient.

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это и эту не не трудно

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?

1 Did the researcher have to include various significant findings of his observations into the report?

2 Does the surgeon have to extend his investigations to make a proper conclusion at present?

3 Do we have to increase the amount of food given to this patient?

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.