直接加er:tall taller tallest
small smaller smallest
new newer newest
clever cleverer cleverest
加r:nice nicer nicest
fine finery finest
把y变i加er:pretty prettier prettiest
easy easier easiest
heavy heavier heaviest
双写最后一个字母加er:slim slimmer slimmest
big bigger biggest
thin thinner thinnest
加more(most):beautiful more beautiful most beautiful
important more important most important
特殊情况:good/well better best
bad worse worst