Auxiliary verbs in echoes, agreement, and emphasisUsing the auxiliary alone to reply, agree, or insist.Related learning areasEnglish GrammarRelated conceptsAdjectives as nouns, and adjective orderArticlesClauses of contrast and purposeFuture perfect and future continuousGerunds and infinitivesNarrative tenses, including past perfect continuousQuestionsAll questions in this subjectStart learningStart free practice