谓语动词是行为动词时,必须在句首加上助动词Do、Does(三单)、Did(过去式)加上这些助动词后,句子中谓语动词必须用原形。
当be在陈述句中做谓语时,则在问句中需将其提前;
当动词在陈述句中做谓语时,则在问句前面加助动词do。
用英语提问时用be、do实际上牵涉到时态和语态。
一般过去时态+被动语态:It was all finished.-->Was it all finished?
一般过去时态+主动语态:He finished his homework yesterday.-->Did he finished his homework yesterday?
温馨提示:答案为网友推荐,仅供参考