课上内容（Lesson)
What 什么是语态？ 语态是动词的一种形式，用以说明主语与谓语动词之间的关系。
英语的语态共有两种：主动语态和被动语态。
Why 为什么要用被动语态？
1. 突出重点想表达的事
2. 用于强调
3. 责任外国人的思维逻辑，国外的逻辑更常用语被动句
PS： 时态/语态 并无直接关系，只是恰巧他们都有过去分词。
How 如何使用被动语态？了解被动语态之前你先要知道什么是主动语态。
e.g.
Somebody built this house in 1981.(active) 有人在1981年建造了这座房子。 # 但是，实际我们在聊天的时候不一定都清楚是谁、什么原因、通常不知道或者不重要
subject object
This house was built in 1981. (passive) 这座房子建于1981年。 # 所以，这个时候用被动句会感觉说的话更有意义，而不会像（active）一样还去关注subject
subject
Compare Passive & Active
1. Present simple:
e.g.
Some body cleans this room every day.
This room is cleaned every day.
Active： clean(s)/see(s) etc. # 主动语态需要注意三单
Passive: am/is/are + cleaned/seen etc.
2. Past simple:
e.g.
Somebody cleaned this room yesterday. # 这里的cleaned 是过去式
This room was cleaned yesterday. # 这里的cleaned 是过去分词
Active： cleand/saw etc.
Passive: was/were + cleaned/seen etc.
3. infinitive: 不定式 to be / 情态动词 + 动词原形
e.g.
Somebody will clean this room later.
This room will be cleaned later.
Active： (to) do/ clean /see etc.
Passive: (to) be + done / cleaned /seen etc.
4. Perfect infinitive: 动词不定式的完成式
e.g.
Somebody should have cleaned the room.
The room should have been cleaned.
Active: (to) have + done/cleaned/seen etc.
Passive: (to) have been + done/cleaned/seen etc.
5. Present perfect
e.g.
The room looks nice.Somebody has cleaned it.
The room looks nice. It has been cleaned.
Active: have/has + done etc.
Passive: have/ has been + done etc.
6. Past perfect
e.g.
The room looked nice. Somebody had cleaned it.
The room looked nice. It had been cleaned.
Active: had + done etc.
Passive: had been + done etc.
7. Present continuous
e.g.
Somebody is cleaning the room at the moment.
The room is being cleaned at the moment.
Active: am/is/are + (do)ing
Passive: am/is/are + being (done)
8. Past continuous
e.g.
Somebody was cleaning the room when I arrived.
The room was being cleaned when I arrived.
Active: was/were + (do)ing
Passive: was/were + being(done)
词汇（Key Word ）
句型（Sentences）
语法（Grammar）