Даю 100 баллов очень необходимо IV. Instead of the modal verbs use

Даю 100 баллов очень нужно
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.