(1). She said, "How nice of you!"

Ans: She exclaimed that I/he/she/we/they was/were very nice.

(2). The teacher said to the student, "Have you purchased a computer?"

Ans: The teacher asked the student if/whether he/she had purchased a computer.

(3). Neeta said to me, "The Sun rises in the East."

Ans: Neeta told me that the Sun rises in the East.