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IV. Instead of the modal verbs use the equivalents in the proper tense:
The doctor must determine the origin of the disease for its successful treatment. 2. The doctor could reveal the consolidation in the lung by the X-ray examination. 3. The scientist can observe a rapid growth of microorganisms under the microscope. 4. The doctor says that this patient may sit up.

1 The doctor is to/ has to determine the origin of the disease for its successful treatment.

2. The doctor was able to reveal the consolidation in the lung by the X-ray examination.

3. The scientist is able to observe a rapid growth of microorganisms under the microscope.

4. The doctor says that this patient is allowed/ is permitted to sit up.