7. Complete the sentences with the correct passive form of the verbs in brackets.

Let's complete the sentences with the correct passive form of the verbs in brackets. 1. This skirt **is made** from silk. 2. A lot of dogs **are fed** in the streets by people. 3. All the concert tickets **are already sold out**. 4. This book **is returned** to the library next week. 5. When **was** the Eiffel Tower **built**? 6. The building **was built** last month. 7. Photography **is not allowed** in the museum. 8. The Leaning Tower of Pisa **is made** of marble. **Explanation:** * Passive voice is used when the subject receives the action. It is formed using a form of the verb "to be" + past participle. * The tense of the verb "to be" depends on the tense required in the sentence. 1. "This skirt" is singular, so we use "is". "Made" is the past participle of "make". Present Simple Passive. 2. "A lot of dogs" is plural, so we use "are". "Fed" is the past participle of "feed". Present Simple Passive. 3. "All the concert tickets" is plural, so we use "are". "Sold out" is the past participle of "sell out". The word "already" goes between "are" and "sold". Present Perfect Passive. 4. "This book" is singular, so we use "is". "Returned" is the past participle of "return". Future Simple Passive. 5. This is a question, so we need to invert the auxiliary verb. "The Eiffel Tower" is singular, so we use "was". "Built" is the past participle of "build". Past Simple Passive. 6. "The building" is singular, so we use "was". "Built" is the past participle of "build". Past Simple Passive. 7. "Photography" is singular, so we use "is". "Not allowed" is the negative form of the passive. Present Simple Passive. 8. "The Leaning Tower of Pisa" is singular, so we use "is". "Made" is the past participle of "make". Present Simple Passive.