Answer:
a. He is as wise as his sister. (change into Negative)
⇒<u>Neither he is wise nor his sister.</u>
b. He put the cup on the shelf. (change into interrogative)
⇒<u>Did he put the cup on the shelf?</u>
c. He said to her. Will you play tomorrow? (change into indirect)
⇒<u>He asked me that whether I play the next day.</u>
d. Doctors cure patients. (Change into passive)
⇒<u>Patients were cured by doctors.</u>
e. She (not eat) yet. (Rewrite it using correct tense)
⇒<u>she hadn't eaten yet.</u>
f. Everybody has eaten..............? (use correct question tag)
⇒<u>Everybody has eaten, haven't they?</u>