The research reported in this paper specifically explores the constructive properties of ergative verbs as a special subclass of English verbs and focuses on examining the students’ knowledge about these verbs through the use of English sentences. Also, its endeavor to pinpoint the errors committed by the students by using these structures. The researchers postulated that English Iraqi students come up against learnability problems to conceive this theme. Hence, it is pondered as one of the problematic subjects for them. A grammatical judgment test is administered on an incidental sample of 50 fourth-year students majoring in English taken part in this study through the colligate year (2019-2020).