Question

Riya said: I can sing folk change into narration

Answer 1

Riya said that she can sing folk.

Answer 2

Answer: Riya said that she could sang folk.

Explanation:

1) "I" will change to "she"

2) "can" will change to "could" (It's a rule)

3) "sing" will change to 2nd Form that is "sang"

4) "folk" will be as it is.