The paper makes a thorough analysis of the argument of the school which holds that English Model Verbs have no tense form at all .By means of formal analysis, semantic analysis and synthetic analysis, the author rejects the argument of“the negative school", verifies that there is a grammatical category of tense for Model Verbs. It can be summarized as follows: Only when we have a full understanding of the semantic essence of the tense, can we expound all the uses of Model verbs correctly and ...