# Ch3-被動語態
## Introdution
1. 主動語態改被動語態口訣: 「主動被動,主受對調」
#### 記得這口訣,被動語句輕鬆拿捏。
2. 被動語態的使用,通常是為了強化受詞描述,弱化主詞在一文句中的地位。
3. 須注意,並非所有動詞皆可以改為被動語態,像是「不及物動詞」就不可使用被動語態。
4. 有時候 by who or by what 不是那麼重要,故可省略,「時間點」反而大多時候是重點。
## 各語句改被動語態
### 簡單式的被動語態
#### 現在簡單式被動: S + am/are/is + p.p.
#### 過去簡單式被動: S + was/were + p.p.
#### 過去簡單式被動: S + will + be + p.p.
* Examples
* 主動
```
1. Many countries speak English.
```
```
2. Someone robbed the bank.
```
* 被動
```
1. English is sopken by many countries.
```
```
2. The bank was robbed by someone.
```
### 進行式的被動語態
#### 現在進行式被動: S + am/are/is + being + p.p.
#### 過去進行式被動: S + was/were + being + p.p.
* Examples
* 主動
```
1. Our teacher was playing movie at 2 last afternoon.
```
```
2. The police is investigating a bank rubbery.
```
* 被動
```
1. A moive was being played by our teacher at 2 last afternoon.
```
```
2. A bank rubbery is being investigated by the police.
```
### 完成式的被動語態
#### 現在完成式被動: S + has/have + been + p.p.
#### 過去完成式被動: S + had + been + p.p.
#### 未來完成式被動: S + will + have + been + p.p.
* Examples
* 主動
```
1. I haven't found my missing purse yet.
```
```
2. The author will have published the book by the end of this year.
```
* 被動
```
1. My missing purse hasn't being found yet.
```
```
2. The book will have been published by the end of this year.
```
### 助動詞的被動語態
#### 助動詞 + be + p.p.
* 常見的助動詞
* [助動詞](https://tw.amazingtalker.com/blog/zh-tw/zh-eng/81790/),後續章節會有更深的介紹。
* Examples
* 主動
```
1. You must lock the door before you leave the house.
```
```
2. The house owner should repaint the building.
```
* 被動
```
1. The door must be locked before you leave.
```
```
2. The building should be repainted.
```
### 不定詞與動名詞的被動
#### 不定詞: to be + p.p.
#### 動名詞: being + p.p.
* 某些片語、介係詞及動詞的組合
* 片語,如 "look forward to"、 "in addition to",須將其後的動詞改為動名詞。
* 介係詞,如 "of"、 "in"、 "with"... 以及特定動詞,如 "enjoy"、 "finish"、 "practice"... 須將其後改為動名詞。
* Examples
* 片語
```
I was looking forward to being invited to the party.
```
* 介係詞
```
The thief is afraid of being arrested all the time.
```
* 特定動詞
```
The idol enjoys being praised by her fans.
```
### 感官動詞
#### 感官動詞: S + be + 感官動詞p.p. + to VR/Ving
* 感官動詞受詞補語為VR時
* 改成被動語句後變成to VR。
* 感官動詞受詞補語為Ving時
* 改成被動語態後仍維持Ving。
* Examples
* 主動
* 受詞補語為VR
```
I saw Tom help an old man crossing the road.
```
* 受詞補語為Ving
```
The passenger heard the baby crying on the whole flght.
```
* 被動
* 受詞補語為VR
```
Tom was seen to help an old man crossing the road.
```
* 受詞補語為Ving
```
The baby was heard crying on the whole flight.
```
### 使役動詞
#### S + have/make + O + p.p.
#### S + be made + to + VR
#### (S) + let + O + be + p.p.
* Examples
* have/make
```
The teacher made the students wash their hands before having lunch.
```
* let
```
I always lets the door be locked all the time.
```