be, do, and have as auxiliary and main verbsThe same word doing two different jobs.Related learning areasEnglish GrammarRelated conceptsAdjectives — order, gradability, and comparisonAdverbs — form and positioncan, could, and be able toFirst and second conditionalsFuture forms — will and be going tohave something doneLeads toVerb form reviewQuestionsAll questions in this subjectStart learningStart free practice