But I was so puzzled that when I tried to sing, I couldn't remember a word of the verse I had written.

verse 是名词，指诗歌中的"节"或"段落"，通常由几行诗句组成，具有特定的韵律和结构。在歌曲中，verse 指的是主歌部分，与副歌（chorus）相对。