Vì câu hỏi của cậu ko rõ ràng là đặt câu hỏi cho bộ phận nào nên mình ghi hết nhé.
My mother decorated the party with blossoms and balloons.
-Who decorated the party with blossoms and balloons?
My mother decorated the party with blossoms and balloons.
-What did your mother do with blossoms and balloons?
My mother decorated the party with blossoms and balloons.
-What did your mother decorated the party with?