Rewrite the following sentences in the passive voice: 1. Mother threw that box away weeks ago. 2. The maid polished the silver yesterday. 3. We must take the dog to the vet. 4. The mayor will open the new cinema tomorrow. 5. We couldn't put out the fire because of the wind. 6. Have you done the washing yet?

Answer
1. That box was thrown away by Mother weeks ago. 2. The silver was polished by the maid yesterday. 3. The dog must be taken to the vet. 4. The new cinema will be opened by the mayor tomorrow. 5. The fire couldn't be put out because of the wind. 6. Has the washing been done (by you) yet? To convert sentences from active to passive voice, we primarily shift the focus from the subject performing the action to the object receiving the action. In passive voice constructions, the past participle of the verb is used along with an appropriate form of the verb 'to be' depending on the tense. 1. In the first sentence, the direct object 'that box' becomes the subject of the passive voice sentence. The verb 'threw' changes to 'was thrown,' and we include the original subject at the end if necessary. 2. In the second sentence, 'the silver' is now the subject, and we again change 'polished' to 'was polished.' 3. The third sentence uses 'must be taken' to indicate that the action is necessary for the dog. 4. The fourth sentence changes 'will open' to 'will be opened.' 5. In the fifth sentence, 'couldn't put out' becomes 'couldn't be put out.' 6. Finally, for the last sentence, 'done' is turned into 'has been done,' and while optional, including 'by you' maintains clarity.