DID 的最简口诀可以是：“Do + not 构成否定句，did + not 构成过去否定句，did + not + 动词原形构成过去完成否定句。
”具体来说，当我们想要表达否定意义时，可以用 do not + 原形动词，例如：- I do not like coffee. （我不喜欢咖啡。）- She does not like pizza. （她不喜欢比萨饼。）当我们想要表达过去否定时，可以用 did not + 原形动词，例如：- He did not come to the party last night. （他昨晚没有来参加聚会。）- She did not finish her homework yesterday. （她昨天没有完成作业。）当我们想要表达过去完成时的否定时，可以用 did not + 原形动词 + have + 过去分词，例如：- He had not eaten breakfast before the exam. （考试之前他还没有吃早饭。）- She had not finished her homework yet. （她还没有完成作业。）希望这个口诀能对您有所帮助！
