谓语

系动词 ：The Double Ninth Festival is the day for the elderly in our culture. (is) 行为动词：I learned from your post that you want to improve your Mandarin. (主句：learned；从句：want) 情态动词+动词原形：Everybody can buy takeaway food. (can buy) 助动词+分词：These plans were abandoned because of financial problems. (were abandoned)

九 种 成 分