Action verbs like run are weak. They cannot lift the word not alone. You cannot say 'We run not.' You must bring in a Helper Verb (do) to carry the negative.
Core Rule: Weak Action Verbs need a Helper (Do/Does) for negatives and questions.
像 run 这样的动作动词是 弱动词。它们无法独自承担 not 这个词。你不能说 'We run not'。你必须引入一个 助动词 (do) 来携带否定。
核心规则: 弱动作动词在否定句和疑问句中需要助动词 (Do/Does) 帮助。