分三种情况 1）be动词作谓语时,把be动词提前 for example：She was a teacher.----->Was she a teacher? 2)行为动词（即一般的动词）作谓语,用助动词did提前,动词为原型 for example:He cleaned the room.------>Did he clean the room? 3）有情态动词作谓语,直接把情态动词提前即可 for example：You could play basketball----->Could you play the basketball?
