### Итоговые ответы
#### Упражнение 1 (a, b)
**a) Формы залогов из текста:**
* **Passive forms (Страдательный залог):**
* `has been caused` (Present Perfect Passive)
* `was still being fought` (Past Continuous Passive)
* `is being cleared away` (Present Continuous Passive)
* `will be started` (Future Simple Passive)
* `is discovered` (Present Simple Passive)
* `had been made` (Past Perfect Passive)
* `were seen` (Past Simple Passive)
* `has yet to be discovered` (Passive Infinitive)
* **Active forms (Действительный залог):**
* `broke out` (Past Simple)
* `said` (Past Simple)
* `was` (Past Simple)
* `had ever seen` (Past Perfect)
* `are treating` (Present Continuous)
* `has` (Present Simple)
* `may help` (Modal verb + bare infinitive)
* `should contact` (Modal verb + bare infinitive)
**b) Исполнитель действия (Agent):**
* Для ввода исполнителя действия используется предлог **`by`** (*например: «...caused **by** a fire...»*).
* Исполнитель опускается (не указывается), когда:
1. Он **неизвестен** (*«Reports had been made...», «two suspicious characters were seen...»*).
2. Он **очевиден** из контекста или не имеет значения (*«The debris is being cleared away...», «The fire was still being fought...»*).
3. Само **действие важнее**, чем тот, кто его совершил.
---
#### Упражнение 2
1. My brother's bike **was stolen** yesterday.
2. This soup **was made** with carrots and coriander.
3. Who **is** Pam's party **being catered by**? *(или: By whom is Pam's party being catered?)*
4. Their house **will have been finished** by May.
5. The thieves **were arrested** by the police.
6. Sam hates **being told** what to do.
7. The 'Fifi Fairy' books **are written** by Maria.
8. An apology **should be made** by Jack.
---
#### Упражнение 3
1. I think there's somebody behind us. — **We are being followed.**
2. He's very angry. — **He hates being kept waiting.**
3. It's private parking. — **Parking is not allowed.**
4. This is very serious. — **Something needs to be done immediately.**
5. Please go now. — **I want to be left alone.**
6. Have you heard the news? — **The Mayor has been shot.**
7. Stella didn't go to the party. — **She hadn't been invited.** *(или: She wasn't invited.)*
8. Can I help you, sir? — **No, thanks. I am being served.**
9. He hasn't received the parcel. — **It may have been sent to the wrong address.**
10. They pulled down the old factory. — **A cinema complex will have been built by next May.** *(или: ...is going to be built by next May.)*
---
#### Упражнение 4
**Текст в пассивном залоге:**
> An unusual way of predicting earthquakes **has been discovered** by scientists in China – snakes! Snakes **are being observed** at local snake farms to see if their behaviour changes before an earthquake. Cameras **are linked** to a broadband Internet connection. It **is believed** that earthquakes **can be sensed** from 120 km away, three to five days before they happen. Nests **are abandoned** or walls **are even smashed into** to escape. Because China **is frequently struck** by earthquakes, a reliable method of predicting them **must be found** to avoid the terrible injury and loss of life that **are caused** by them.
**Где исполнитель (agent) не нужен:**
* *(by experts)* — очевидно, что наблюдение ведут специалисты;
* *(by the scientists)* — понятно из предыдущего контекста;
* *(by people / by scientists)* — в безличных конструкциях и обобщениях (*It is believed...*);
* *(by the snakes)* — понятно, о ком речь (*nests are abandoned...*);
* *(by scientists)* во фразе *a reliable method must be found* — фокус на самом методе.
---
#### Упражнение 5
**Правило образования:**
* **Impersonal construction (Безличная):** `It + passive verb + that-clause` (глагол в пассиве согласуется с *It* в нужном времени, далее следует придаточное предложение без изменений).
* **Personal construction (Личная):** `Subject + passive verb + to-infinitive`:
* *Simple / Continuous Infinitive* (`to do` / `to be doing`), если действие относится к настоящему или будущему времени;
* *Perfect Infinitive* (`to have done` / `to have been doing`), если действие в придаточном предложении произошло раньше действия главного предложения (в прошлом).
**Предложения:**
1. **P:** She is believed to be resting at home.
**I:** It is believed that she is resting at home.
2. **P:** The doctor is reported to have made a mistake in the diagnosis.
**I:** It is reported that the doctor made a mistake in the diagnosis.
3. **P:** The tsunami is expected to hit at 8 am.
**I:** It is expected that the tsunami will hit at 8 am.
4. **P:** She is known to have a difficult character.
**I:** It is known that she has a difficult character.
5. **P:** A monster is said to live in a lake in Scotland.
**I:** It is said that a monster lives in a lake in Scotland.
6. **P:** Andrea is believed to have been treated very badly.
**I:** It is believed that Andrea was treated very badly.
7. **P:** The number of cases of asthma is thought to be rising.
**I:** It is thought that the number of cases of asthma is rising.
---
### Подробное объяснение и грамматический справочник
1. **Базовая формула Passive Voice:**
$$\text{Подлежащее} + \text{to be (в нужном времени)} + V_3 \text{ (Past Participle)}$$
* Дополнение активного предложения переходит на место подлежащего.
* Исполнитель действия с предлогом **by** ставится только тогда, когда важно подчеркнуть, кто именно совершил действие (например, автор книги: *by Maria*).
2. **Особенности временных форм и конструкций:**
* **Герундий в пассиве:** *hates people telling him* $\rightarrow$ *hates **being told*** (Упр. 2.6, 3.2).
* **Модальные глаголы:** $\text{Modal} + \text{be} + V_3$ (*should be made*, *needs to be done*).
* **Перфектный инфинитив с модальными глаголами:** $\text{Modal} + \text{have been} + V_3$ (*may have been sent* — предположение о действии в прошлом).
3. **Личные (Personal) и безличные (Impersonal) структуры:**
* Используются с глаголами мнения и сообщения (*say, think, believe, report, know, expect*).
* В личных структурах ключевым моментом является выбор правильного инфинитива:
* Обычный факт / настоящее время: *She has...* $\rightarrow$ *to have*; *a monster lives...* $\rightarrow$ *to live*.
* Процесс в настоящем: *she is resting...* $\rightarrow$ *to be resting*; *is rising...* $\rightarrow$ *to be rising*.
* Прошедшее время: *the doctor made...* $\rightarrow$ *to have made*; *Andrea was treated...* $\rightarrow$ *to have been treated*.