**Rule**: In a sentence with an object and an object complement, the object becomes the subject of the passive sentence, and the complement remains. The structure for Future Simple is **Object + will + be + V3 + Complement**.

- **Correct Answer (a)**: The object 'him' becomes the subject 'He'. The verb form 'will be elected' is correct. The object complement 'President' follows the verb.
- **Incorrect Answer (b)**: 'would' is an incorrect modal change.
- **Incorrect Answer (c)**: This incorrectly changes the tense to Simple Present.
- **Incorrect Answer (d)**: This is grammatically awkward; 'He' is the one being elected, so 'He' should be the subject.

**Rule**: To convert a Past Continuous Tense sentence to passive voice, the structure is **Object + was/were + being + V3 + by + Subject**.

- **Correct Answer (a)**: The object 'a hole' becomes the subject. Since it's singular, 'was' is used, followed by 'being' and the past participle 'dug'. The prepositional phrase 'in the ground' is correctly placed.
- **Incorrect Answer (b)**: This incorrectly changes the tense to Present Perfect.
- **Incorrect Answer (c)**: This incorrectly changes the tense to Present Continuous.
- **Incorrect Answer (d)**: While grammatically possible, starting with the prepositional phrase makes the sentence less natural than option (a).

**Rule**: For sentences in the Present Continuous Tense with a phrasal verb (like 'look into'), the passive structure is **Object + is/am/are + being + V3 (of main verb) + preposition + by + Subject**.

- **Correct Answer (b)**: The object 'the matter' becomes the subject. The verb form 'is being looked into' correctly reflects the passive voice of the Present Continuous Tense, keeping the preposition 'into' with the verb.
- **Incorrect Answer (a)**: This incorrectly changes the tense to Simple Present.
- **Incorrect Answer (c)**: This incorrectly changes the tense to Present Perfect.
- **Incorrect Answer (d)**: This incorrectly changes the tense to Past Continuous.

**Rule**: For negative imperative sentences (commands or advice), the passive voice can be formed using the structure **Let + object + not + be + V3**.

- **Correct Answer (a)**: This option correctly follows the 'Let' structure for a negative command. 'the poor' is the object, followed by 'not be' and the past participle 'insulted'.
- **Incorrect Answer (b)**: While 'You are warned' can be used for some commands, the 'Let' structure is a more direct and common passive form for this type of imperative.
- **Incorrect Answer (c)**: 'Should' introduces a sense of moral obligation or advice, which changes the tone from a direct command.
- **Incorrect Answer (d)**: This structure ('are not to be') is grammatically awkward and not the standard passive form for this imperative.

**Rule**: For sentences with a reporting verb (like believe, say, think) and a 'that'-clause, one common passive form starts with **'It'**. The structure is **It + is/was + V3 (of reporting verb) + that-clause**.

- **Correct Answer (a)**: The sentence is correctly transformed by starting with 'It', followed by the passive form of 'believe' ('is believed'), and then the original 'that'-clause remains unchanged.
- **Incorrect Answer (b)**: This changes the tense of the reporting verb to past ('was believed') and alters the structure, which is a different type of passive transformation that is less direct here.
- **Incorrect Answer (c)**: The word order is awkward and unnatural.
- **Incorrect Answer (d)**: This structure is grammatically incorrect and confusing.

**Rule**: For a sentence in the Simple Past Tense, the passive voice structure is **Object + was/were + V3 + by + Subject**.

- **Correct Answer (c)**: The object 'the entire class' becomes the subject. 'Class' is a collective noun treated as a single unit here, so the singular verb 'was' is used, followed by the past participle 'punished'.
- **Incorrect Answer (a)**: This incorrectly changes the tense to Simple Present.
- **Incorrect Answer (b)**: This incorrectly changes the tense to Past Continuous.
- **Incorrect Answer (d)**: This incorrectly changes the tense to Present Perfect.

**Rule**: This question asks to convert a passive sentence to an active one. The passive sentence is in the Simple Present Tense. The structure is **Subject + is/am/are + V3 + to + object**. The corresponding active structure is **New Subject (object from passive) + V1 + New Object (subject from passive)**.

- **Correct Answer (a)**: The object of the preposition 'to', which is 'me', becomes the subject 'I'. The verb 'is known' becomes the simple present verb 'know'. The subject of the passive sentence, 'He', becomes the object 'him'.
- **Incorrect Answer (b)**: This is another passive sentence.
- **Incorrect Answer (c)**: This reverses the subject and object, changing the meaning.
- **Incorrect Answer (d)**: This incorrectly changes the tense to Present Perfect.

**Rule**: For a sentence in the Present Perfect Tense, the passive voice structure is **Object + has/have + been + V3 + by + Subject**.

- **Correct Answer (c)**: The object 'The match' becomes the subject. Since it's singular, 'has' is used, followed by 'been' and the past participle 'won'.
- **Incorrect Answer (a)**: This incorrectly changes the tense to Simple Past.
- **Incorrect Answer (b)**: This incorrectly changes the tense to Simple Present.
- **Incorrect Answer (d)**: This incorrectly changes the tense to Past Perfect.

**Rule**: To convert a Past Continuous Tense sentence to passive voice, the structure is **Object + was/were + being + V3 + by + Subject**.

- **Correct Answer (d)**: The object 'a lot of noise' becomes the subject. Since 'noise' is singular, 'was' is used, followed by 'being' and the past participle of 'make' which is 'made'.
- **Incorrect Answer (a)**: This option incorrectly changes the tense to Simple Past.
- **Incorrect Answer (b)**: This option incorrectly changes the tense to Present Continuous.
- **Incorrect Answer (c)**: This option incorrectly changes the tense to Present Perfect.

**Rule**: For interrogative sentences starting with a 'Wh-' word (like Why, What, When) in the Simple Past Tense, the passive structure is **Wh- word + was/were + object + V3 + by + subject?**

- **Correct Answer (a)**: The 'Wh-' word 'Why' remains at the beginning. The object 'such a good opportunity' is singular, so 'was' is used. The past participle of 'waste' is 'wasted'.
- **Incorrect Answer (b)**: This option incorrectly changes the tense to Simple Present.
- **Incorrect Answer (c)**: This option incorrectly changes the tense to Present Perfect.
- **Incorrect Answer (d)**: This option incorrectly changes the tense to Past Perfect.