分词短语做定语在大多数情况下都可与定语从句相转换。这是非谓语动词的语法特点。
The
school
which
was
built
twenty
years
ago
is
our
school=The
school
built
twenty
years
ago
is
our
school
但完成式的现在分词短语不能用作定语。如果两个动作有先后，要用定语从句。
误：This
is
one
of
the
factories
having
been
built
in
1980.
正：This
is
one
of
the
factories
that
were
built
in
1980.
正：This
is
one
of
the
factories
built
in
1980.
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