Do his parents sometimes have noodles and fish for supper?改为---------------- his parents sometimes --------noodles and fish for supper这句不是一般疑问句吧。就算不是，那怎么改呢？如果要改为疑问句，则应该是： 要么就改为一般疑问句： Do his parents sometimes have noodles and fish fot supper? 因为parents虽然是第三人称，但它是复数，所以要用do提问。要么就改为特殊疑问句： What do your parents sometimes have for supper?(对noodles和fish提问)。