如果直接引语中的情态动词没有过去时的形式（如：ought to， had better, used to)和已经是过去时的形式时，（如：could, should, would, might）不再变。如： Peter said. "You had better come have today。" →Peter said I had better go there that day。 当然如果主句是一般过去时，从句中若含有can--could ,shall--should ,will--would, may---might .
答：既生瑜，何生亮 》》》详情>>
