1.少数"辅音字母+y"结尾双音节词改yi再加-er-estly缀只能加more/most.
：easy(容易) easier easiest
busy(忙) busier busiest
lovely(爱) more lovely most lovely
2.少数-er-ow结尾双音节词未尾加-er-est
：clever(聪明) cleverer cleverest
narrow(窄) narrower narrowest
其余双音节词形容词或副词比较级和高级好像都原词前加more/most