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一般现在时的被动语态构成：is
/
am
/
are
+
及物动词的过去分词
our
classroom
is
cleaned
everyday.
i
am
asked
to
study
hard.
knives
are
used
for
cutting
things.
/
am
/
are
+
及物动词的过去分词
our
classroom
is
cleaned
everyday.
i
am
asked
to
study
hard.
knives
are
used
for
cutting
things.
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the classroom is cleaned by us
the classroom was cleaned by us
the classroom was cleaned by us
本回答被提问者采纳
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This classroom is cleaned by us.
This classroom was cleaned by us.
This classroom was cleaned by us.
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The classroom is/was cleaned/swept by us.
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