Active and Passive Voice

The passive voice is a grammatical construction where the subject of the sentence receives the action rather than performing it. The basic structure of a passive sentence is 'object + form of 'to be' + past participle of the main verb'. When a modal verb (like 'can', 'could', 'will', 'would', 'may', 'might', 'must', 'should') is present in the active voice, it is retained in the passive voice, followed by 'be' and the past participle.

The original sentence, "He can solve the problem," is in the active voice, with 'He' as the subject, 'can solve' as the verb phrase, and 'the problem' as the object. To convert this to passive voice, 'the problem' becomes the new subject. The modal verb 'can' is kept, followed by 'be', and then the past participle of 'solve', which is 'solved'. Therefore, the correct passive voice is The problem can be solved.

• The problem could be solved is incorrect because it changes the modal verb from 'can' (present ability) to 'could' (past ability or possibility), altering the original meaning.
• The problem is solved is incorrect because it uses the simple present passive, removing the modal verb 'can' and its meaning of ability.
• The problem has been solved is incorrect because it uses the present perfect passive, which changes the tense and aspect, implying completion rather than ability.

Converting an active voice sentence to passive voice involves shifting the focus from the doer of the action to the receiver of the action. The original sentence, "They were repairing the road," is in the past continuous tense (subject + was/were + -ing form of verb + object). When converting continuous tenses to passive voice, the structure is 'object + form of 'to be' (matching original tense) + being + past participle of the main verb'.

In the given sentence, 'the road' is the object, 'were repairing' is the verb phrase, and 'they' is the subject. To form the passive voice, 'the road' becomes the new subject. Since 'the road' is singular and the original tense is past continuous, we use 'was'. We then add 'being' to maintain the continuous aspect, followed by the past participle of 'repair', which is 'repaired'. Thus, the correct passive voice is The road was being repaired.

• The road was repaired is incorrect because it uses the simple past passive, which changes the aspect from continuous (ongoing action) to simple (completed action).
• The road is being repaired is incorrect because it uses the present continuous passive, changing the tense from past to present.
• The road has been repaired is incorrect because it uses the present perfect passive, which changes both the tense and aspect, implying completion in relation to the present, not an ongoing past action.

The question asks for the correct passive voice conversion of the sentence: "People speak English all over the world."

The original sentence is in the present simple active voice, indicating a general truth or habitual action. To transform an active sentence into passive voice, the object of the active sentence becomes the subject of the passive sentence, and the verb form changes to a form of 'to be' plus the past participle of the main verb. The agent (the doer of the action) is often omitted if it's general or unimportant.

• A: English is spoken all over the world. This is the correct passive voice. 'English' (the object) becomes the subject, and 'speak' (present simple) correctly transforms into 'is spoken' (present simple of 'to be' + past participle).
• B: English was spoken all over the world. This uses the past simple passive ('was spoken'), changing the tense from present to past, which is incorrect.
• C: English speaks all over the world. This sentence remains in the active voice and implies English itself performs the action, which is grammatically incorrect and illogical.
• D: English has spoken all over the world. This uses the present perfect active voice ('has spoken'), which is the wrong tense and still in the active voice.

The question requires converting the sentence "She is writing a letter" into its correct passive voice form.

The original sentence is in the present continuous active voice, indicating an action happening at the moment of speaking. To convert a present continuous active sentence to passive voice, we follow the structure: object + is/am/are + being + past participle of the main verb + (by agent).

• C: A letter is being written by her. This is the correct passive voice. 'A letter' (the object) becomes the subject. The verb 'is writing' (present continuous active) correctly transforms into 'is being written' (present continuous of 'to be' + 'being' + past participle). The agent 'by her' is included as it specifies who is performing the action.
• A: A letter is written by her. This is in the present simple passive voice ('is written'), changing the tense from continuous to simple, which is incorrect.
• B: A letter was being written by her. This uses the past continuous passive voice ('was being written'), incorrectly shifting the tense from present to past.
• D: A letter has been written by her. This is in the present perfect passive voice ('has been written'), which is the wrong tense for the original continuous action.

The task is to find the correct passive voice for the sentence: "They have completed the work."

The original sentence is in the present perfect active voice, indicating an action that started in the past and has a connection to the present, or was completed at an unspecified time before now. To form the present perfect passive voice, the structure is: object + has/have + been + past participle of the main verb + (by agent).

• C: The work has been completed. This is the correct passive voice. 'The work' (the object) becomes the subject. Since 'the work' is singular, 'has' is used. The verb 'have completed' (present perfect active) correctly transforms into 'has been completed' (present perfect of 'to be' + 'been' + past participle). The agent 'by them' is omitted as it's often unnecessary when the focus is on the action or result.
• A: The work was completed. This is in the past simple passive voice ('was completed'), incorrectly changing the tense from present perfect to past simple.
• B: The work has completed. This remains in the active voice and implies 'the work' itself performed the action, which is grammatically incorrect.
• D: The work is completed. This is in the present simple passive voice ('is completed'), which changes the tense and aspect from present perfect.

The question asks for the correct passive voice of the sentence: "He will finish the task."

The original sentence is in the simple future active voice, indicating an action that will happen in the future. To convert a simple future active sentence to passive voice, the structure is: object + will + be + past participle of the main verb + (by agent).

• B: The task will be finished. This is the correct passive voice. 'The task' (the object) becomes the subject. The verb 'will finish' (simple future active) correctly transforms into 'will be finished' (will + 'be' + past participle). The agent 'by him' is omitted, which is common when the focus is on the action or the recipient.
• A: The task is finished. This is in the present simple passive voice ('is finished'), incorrectly changing the tense from future to present.
• C: The task was finished. This is in the past simple passive voice ('was finished'), incorrectly changing the tense from future to past.
• D: The task has been finished. This is in the present perfect passive voice ('has been finished'), which is the wrong tense and aspect for a simple future action.

The question requires converting the sentence "Someone stole my bag" into its correct passive voice form.

The original sentence is in the simple past active voice, indicating an action that was completed in the past. To convert a simple past active sentence to passive voice, the structure is: object + was/were + past participle of the main verb + (by agent). When the agent ('someone', 'people', 'they') is unknown or unimportant, it is usually omitted in the passive voice.

• A: My bag was stolen. This is the correct passive voice. 'My bag' (the object) becomes the subject. The verb 'stole' (simple past active) correctly transforms into 'was stolen' (simple past of 'to be' + past participle). The agent 'someone' is correctly omitted as it is unspecified.
• B: My bag is stolen. This is in the present simple passive voice ('is stolen'), incorrectly changing the tense from past to present.
• C: My bag has stolen. This remains in the active voice (present perfect active) and implies 'my bag' performed the action, which is illogical.
• D: My bag stole. This remains in the active voice (simple past active) and implies 'my bag' performed the action, which is illogical.

This question tests your understanding of converting an active voice sentence into its passive voice equivalent, specifically for the past perfect tense. The original sentence, "She had cooked dinner," is in the active voice, past perfect tense (Subject + had + past participle + Object).

To transform a past perfect active sentence into passive voice, the structure changes to: Object + had + been + past participle + (by Subject). In this case, "dinner" is the object, so it becomes the subject of the passive sentence. Following the rule, "dinner" is followed by "had been" and the past participle "cooked."

• A: "Dinner is cooked" is incorrect because it uses the simple present passive tense.
• B: "Dinner was cooked" is incorrect as it uses the simple past passive tense.
• D: "Dinner has been cooked" is incorrect because it uses the present perfect passive tense.

Only C: "Dinner had been cooked" correctly applies the past perfect passive voice structure, maintaining the original tense and meaning while shifting the focus from the doer of the action to the action itself and its recipient.

This question requires converting a sentence from active to passive voice, specifically focusing on the present continuous tense. The original sentence, "They are watching a movie," is in the active voice, present continuous tense (Subject + am/is/are + present participle + Object).

To convert a present continuous active sentence into passive voice, the structure is: Object + am/is/are + being + past participle + (by Subject). Here, "a movie" is the object, which becomes the subject of the passive sentence. Since "a movie" is singular, it takes "is." The continuous aspect is maintained by "being," followed by the past participle of "watch," which is "watched."

• A: "A movie is watched" is incorrect because it uses the simple present passive tense, losing the continuous aspect.
• B: "A movie was being watched" is incorrect as it uses the past continuous passive tense, changing the original tense.
• D: "A movie has been watched" is incorrect because it uses the present perfect passive tense, altering both the tense and aspect.

Therefore, C: "A movie is being watched" is the correct passive voice construction, accurately reflecting the present continuous tense of the original sentence.

This question tests the conversion of a simple past active voice sentence into its passive voice form. The original sentence, "The teacher punished the boy," is in the active voice, simple past tense (Subject + simple past verb + Object).

To transform a simple past active sentence into passive voice, the structure is: Object + was/were + past participle + (by Subject). In this sentence, "the boy" is the object, so it becomes the subject of the passive sentence. Since "the boy" is singular, it takes "was." The past participle of "punish" is "punished."

• B: "The boy is punished" is incorrect because it uses the simple present passive tense, changing the original tense.
• C: "The boy has punished" is incorrect as it is in the present perfect active voice, not passive, and changes the tense.
• D: "The boy punished" is incorrect because it remains in the simple past active voice, failing to convert to passive.

Thus, A: "The boy was punished" is the correct passive voice construction. It accurately shifts the focus from the teacher (the doer) to the boy (the recipient of the action) while maintaining the simple past tense.