can, could, and be able toAbility across time, including where a modal will not go.Related learning areasEnglish GrammarRelated conceptsAdjectives — order, gradability, and comparisonAdverbs — form and positionbe, do, and have as auxiliary and main verbsFirst and second conditionalsFuture forms — will and be going tohave something doneQuestionsAll questions in this subjectStart learningStart free practice