1 Was George doing his homework at nine last night?2 Has your father driven a truck for 10 years?
陈述句变一般疑问句的方法：
句中有动词be( am ,is ,are ,was ,were),情态动词（can / could ,may ,must ,will ,would 等）,助动词（如完成时态中的HAS / HAD ） ,变一般疑问句直接把这些词提到句首； 否则在句首加助动词Do ,Does （主语第三人称单数）,Did （一般过去时）,原来的动词要还原；另外,句中有SOME 是一般改为ANY .有already 时要改为yet （且放在句末）