**Rule**: For active sentences using the 'be going to' future form, the passive structure is **Object + is/am/are + going to be + V3**. The agent 'by them' can be omitted. - **Correct Answer (d)**: The object 'a satellite' becomes the subject. The structure 'is going to be launched' is the correct passive conversion. The agent 'by them' is correctly omitted. - **Incorrect Answer (a)**: This is the passive of the Present Continuous tense. - **Incorrect Answer (b)**: This introduces the idea of necessity, which was not in the original sentence. - **Incorrect Answer (c)**: This changes the structure to the 'will' future.

**Rule**: For an interrogative Simple Past Tense sentence with two objects starting with 'Who', the indirect object can become the subject in the passive form, which starts with **'By whom'**. - **Correct Answer (b)**: 'Who' becomes 'By whom'. The indirect object 'you' becomes the subject, which takes the plural verb 'were', followed by the past participle 'sent'. The direct object 'this gift' follows. - **Incorrect Answer (a)**: 'was' is incorrect with the pronoun 'you'. - **Incorrect Answer (c)**: This incorrectly changes the tense to Present Perfect. - **Incorrect Answer (d)**: 'who' is the incorrect case; 'whom' is required after the preposition 'By'.

**Rule**: For an interrogative sentence with 'will have to' starting with 'Who', the passive structure is **By whom + will + object + have to be + V3?** - **Correct Answer (b)**: 'Who' becomes 'By whom'. The structure 'will...have to be signed' is the correct passive form for the future necessity. The word order is correct for a question. - **Incorrect Answer (a)**: This omits 'have to', changing the meaning. - **Incorrect Answer (c)**: 'would' is an incorrect modal change. - **Incorrect Answer (d)**: This is the passive of the Future Perfect Tense.

**Rule**: Intransitive verbs (like 'perform well' without a direct object) cannot be made passive directly. The action must be nominalized or an implied object introduced. - **Correct Answer (a)**: The action 'performing well' is nominalized into 'The performance'. The verb 'do' is introduced to carry the passive voice ('was not being done'). This is a logical way to restructure the sentence. - **Incorrect Answer (b)**: 'Well' is an adverb and cannot be the subject. - **Incorrect Answer (c)**: This structure is grammatically incorrect. - **Incorrect Answer (d)**: While introducing an object like 'the game' is possible, it assumes context not present in the original sentence. Option (a) is a more direct restructuring.

**Rule**: When the active sentence uses 'will have to', the passive form is **Object + will have to + be + V3**. - **Correct Answer (d)**: The object 'its strategy' becomes the subject. The structure 'will have to be changed' is the correct passive form for the future necessity. - **Incorrect Answer (a)**: This omits 'have to', changing the meaning. - **Incorrect Answer (b)**: 'would' is an incorrect modal change. - **Incorrect Answer (c)**: This is the passive of the Future Perfect Tense.

**Rule**: To convert a Future Perfect Tense sentence to passive voice, the structure is **Object + will/shall + have been + V3 + by + Subject**. - **Correct Answer (c)**: The object 'the verdict' becomes the subject. The verb form 'will have been announced' is the correct passive construction for the Future Perfect Tense. - **Incorrect Answer (a)**: This incorrectly changes the tense to Future Simple. - **Incorrect Answer (b)**: 'would' is an incorrect modal change. - **Incorrect Answer (d)**: This incorrectly changes the tense to Simple Present.

**Rule**: For an interrogative sentence in the Past Continuous Tense starting with 'Who', the passive structure is **By whom + was/were + object + being + V3?** - **Correct Answer (a)**: 'Who' becomes 'By whom'. The object 'the car' is singular, so 'was' is used, followed by 'being' and the past participle 'driven'. - **Incorrect Answer (b)**: This incorrectly changes the tense to Simple Past. - **Incorrect Answer (c)**: This incorrectly changes the tense to Present Continuous. - **Incorrect Answer (d)**: 'who' is the incorrect case; 'whom' is required after the preposition 'By'.

**Rule**: For a negative sentence in the Past Continuous Tense, the passive structure is **Object + was/were + not + being + V3**. The agent 'by them' can be omitted. - **Correct Answer (a)**: The object 'enough information' becomes the subject. The passive verb form 'was not being provided' correctly reflects the negative Past Continuous tense. The agent is correctly omitted. - **Incorrect Answer (b)**: This incorrectly changes the tense to Present Perfect. - **Incorrect Answer (c)**: This incorrectly changes the tense to Simple Past. - **Incorrect Answer (d)**: This incorrectly changes the tense to Present Continuous.

**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 'a beautiful portrait' becomes the subject. Since it is singular, 'was' is used, followed by the past participle 'painted'. - **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**: When the active sentence uses 'will have to', the passive form is **Object + will have to + be + V3**. - **Correct Answer (d)**: The object 'the training' becomes the subject. The structure 'will have to be completed' is the correct passive form for the future necessity. - **Incorrect Answer (a)**: 'would' is an incorrect modal change. - **Incorrect Answer (b)**: This omits 'have to', changing the meaning from future necessity to a simple future action. - **Incorrect Answer (c)**: 'will have been completed' is the passive of the Future Perfect Tense.