不规则动词的过去式和过去分词变化规则表1:1、A—A—A型,即原形、过去式和过去分词三者都相同
cost—cost—costcut—cut—cuthit—hit—hithurt—hurt—hurtlet—let—letput—put—putread—read—read2、A—B—B型,即过去式、过去分词相同
1)过去式和过去分词都含有-ought
bring—brought—broughtbuy—bought—boughtthink—thought—thoughtfight-fought-fought2)词尾有-ild,-end时,只需把d变为t
build—built—builtlend—lent—lentsend—sent—sentspend—spent—spent3)过去式、过去分词都含有-aught
catch—caught—caughtteach—taught—taught4)把-eep变为-ept
keep—kept—keptsleep—slept—sleptsweep—swept—swept5)把-ell变为-old
tell—told—toldsell—sold—sold6)过去式、过去分词都含有-elt或-ilt
smell—smelt—smeltspell—spelt—speltfeel—felt—felt7)过去式、过去分词都在原形词尾加t
learn—learnt—learntmean—meant—meant8)过去式、过去分词词尾去y变-id
say—said—saidpay—paid—paidlay—laid—laidhear—heard—heard9)改变元音字母
meet—met—metget—got—gotsit—sat—satfind—found—foundhold—held—heldshine—shone—shonewin—won—w