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.
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