被动语态表示动作的被执行或承受；而系表结构表示主语的特点，性质或状态
过去分词由too，very，so，
much等修饰
e.g.
she
was
so
shocked
that
she
couldn’t
say
a
word.
过去分词为表示心理，感情，处所等
e.g.
he
is
lost
in
thoughts.
the
school
is
located
in
the
center
of
the
city.
过去分词为表示
“必然性，趋势性，意向决心等
e.g.
the
boy
is
determined
to
get
the
book.
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