Your Key to Learning the English Verb System. To master speaking and writing in English, you have to be comfortable using its verb system. Beyond the conjugation of regular and irregular verbs, you must know how to use these words correctly. English Verb Drills will help you confidently use verbs through extensive exercises. Whether used as a textbook supplement in an ESL course or as a self-study text for learning and review, English Verb Drills will simplify the complexities of this crucial area of your language studies. This comprehensive book features: Numerous exercises that demonstrate how the English verb system works; A final Mastery Check to reinforce your learning; An answer key to give you immediate clarification on any concept.