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been
have/has
had
had
do/does
did
done
2. AAA型 （三者一致）
cut cut cut
let let let
put put put
cost cost cost
read read read
3. ABA型 （过去分词与原形一致）
come
become
run
ran run
came come
became become
4. ABB型 （过去分词与过去式一致）
bring
find
hear
keep
make
brought brought
found found
heard heard
kept kept