In English, auxiliary verbs (have and be) and modal verbs behave differently from all other verbs. For example, they combine differently with negatives, as shown in the following table for auxiliaries (have and be), a modal verb (can) and another verb (go). TypePositiveNegativeAux (have)You have goneYou have not goneAux (be)You are goingYou are not goingModalYou…… Continue reading You need not understand