是被动语态。
要注意的是：把主动语态的谓语变成被动语态的be+
过去分词，时态要与原句保持一致。
They
will
build
a
new
bridge
over
the
river.
(主动)
A
new
bridge
will
be
built
over
the
river.
(被动)
My
aunt
invited
me
to
her
dinner
party.
I
was
invited
(by
my
aunt
)to
her
dinner
party.
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