中小学英语:“it”用法详解答:He can drive a car, can’t he? They used to have difficulty in just making ends meet, didn’t (usedn’t) they? You’d better eat with knives and forks, hadn’t you? 2.如果主语带有seldom, hardly, never, rarely, few, little等否定词或半否定词时,因为主句本身具有否定意义,附加疑问...