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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 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 to 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.