动词变单三的规则：
1. 一般的动词在词尾加---s. work—works, read----reads
2. 以s,x,ch,sh,及辅音字母+o结尾的单词在词尾加---es. Watch---watches,do----does.
3. 以辅音字母加y结尾的动词变y为i，再加---es. fly---flies.
4. 以元音字母加y结尾的动词直接在词尾加—s. play---plays
5. 不规则变化。如：have---has
动词变现在分词（ing）的规则：
1. 一般情况在词尾加---ing. 如：work---working.
2. 以不发音字母e结尾的，去e再加—ing.如：take---taking,make---making.
3. 以重读闭音节结尾且末尾只有一个辅音字母的，要双写末尾的辅音字母再加—ing.如：swim---swimming, run ---running.
4. 以字母ie结尾的动词，将ie变为y再加 ing。如：die---dying.动词过去式变化规则：
1．一般在动词末尾加-ed，如：pull-pulled, cook-cooked
2．结尾是e加d，如：taste-tasted
3．末尾只有一个元音字母和一个辅音字母的重读闭音节，应双写末尾的辅音字母，再加-ed，如：stop-stopped
4．以“辅音字母+y”结尾的，变y为i，再加-ed，如：study-studied
AB型
can could shall should will would may might
AAA型
cost cost cost cut cut cut hit hit hit hurt hurt hurt let let let
must must must put put put set set set shut shut shut read read read
AAB型
beat beat beaten
ABA型
become became become come came come run ran run
ABB型
bring brought brought buy bought bought think thought thought
catch caught caught teach taught taught build built built lend lent lent send sent sent spend spent spent dig dug dug hang hung hung feel felt felt
keep kept kept sleep slept slept sweep swept swept
leave left left smell smelt smelt spill spilt spilt
lay laid laid pay paid paid say said said
sell sold sold tell told told sit sat sat spit spat spat stand stood stood understand understood understood
learn learnt learnt mean meant meant spoil spoilt spoilt
shine shone shone win won won have had had
make made made hear heard heard find found found hold held held ABC型
begin began begun drink drank drunk ring rang rung sing sang sung sink sank sunk swim swam swum blow blew blown
fly flew flown grow grew grown know knew known throw threw thrown draw drew drawn
show showed shown
break broke broken choose chose chosen forget forgot forgotten freeze froze frozen speak spoke spoken wake woke woken
drive drove driven
eat ate eaten
fall fell fallen
give gave given
hide hid hidden
ride rode ridden
rise rose risen
take took taken
mistake mistook mistaken write wrote written
am/is was been
are were been
do did done
go went gone
lie lay lain
see saw seen
wear wore worn
易错型
show showed shown
draw drew drawn
fall fell fallen
feel felt felt
hold held held
help helped helped
think thought thought thank thanked thanked take took taken
talk talked talked
get got got
forget forgot forgotten meet met met
mean meant meant
hit hit hit
hide hid hidden
ring rang rung
bring brought brought
eat ate eaten
beat beat beaten
lie lay lain
lay laid laid
find found found
found founded founded
buy bought bought
bring brought brought learn learnt learnt
hear heard heard
5．过去式和过去分词有两种形式（以下全是ABB）
burn burned burned
burnt burnt
learn learned learned
learnt learnt
