第1个回答 2019-10-17
被动语态
英语动词有主动语态和被动语态之分。在主动句中，动词的主语是执行动作的人或物。在被动句中，主语是动作的承受者。在英语中被动态用得很普通，这样做可以避免用不明确的词作主语，或是将说话的重点放在事件而不是造成该时间的人或物上。
被动语态的构成：be+过去分词。过去分词不一定指过去。
1）一般现在时形式：am/are/is+过去分词
The
room
is
aired
regularly.
The
knives
are
sharped
regularly.
2)一般过去时形式：was/were+过去分词
She
was
dressed
in
red.
The
windows
were
opened
this
morning.
3)英语中表达情感的动词通常可用于被动式，这些动词如amuse,embarrass,worry,surprise,interest,upset等
She
is
embarrassed.
They
were
worried.
被动语态的现在完成时和一般将来时
1)现在完成时形式：has/have+been+过去分词
The
basket
has
already
been
emptied.
They
have
already
been
invited.
2）一般将来时形式：will/shall+be+过去分词
The
floor
will
be
swept
soon.
The
knives
will
be
sharpened
soon.