i need help on piano

Answer:
DM-DM-AM-DM
DM-DM-AM-DM
Dm-Dm-AM-Dm
(Sorry it’s repetitive- not many chords to choose from...)
Explanation:
To harmonize a piece, identify the notes in the chords you will use and match them to the melody of the piece.
Ex. In measure 9 there is a modulation to the key of d minor, so to match you would use a d minor chord to match the f natural.