時(shí)態(tài)看謂語(yǔ)動(dòng)詞.這句話的謂語(yǔ)動(dòng)詞是had,是have的過(guò)去式,所以是過(guò)去時(shí)Mymotherusuallycutthemeat intopiece.改為否定，一般疑問(wèn)句這句話的cut是過(guò)去式，因?yàn)閙y mother 是第三人稱單數(shù)，后面的謂語(yǔ)動(dòng)詞不會(huì)用原形，只能是三單或過(guò)去式。而cut不是三單，只能是過(guò)去式否定 My mother didn't usually cut the meat into pieces.一般疑問(wèn) Did your mother usually cut the meat into pieces?