am/is,was
are,were
begin,began
buy,bought
come,came
do,did
eat,ate
get,got
give,gave
go,went
have/has,had
make,made
run,ran
sing,sang
take,took
swim swam
meet,met
spend,spent
read,read（读法不一样,读red）
see sawmeet,spend,read和see呢？写上去了