Structure of passive tenses

Structure of passive forms
positive negative question
The office is cleaned twice a week. The office isn't (is not) cleaned twice a week. Is the office cleaned twice a week?
The office is being cleaned at the moment. The office isn't (is not) being cleaned at the moment. Is the office being cleaned at the moment?
The office has already been cleaned. The office hasn't (has not) been cleaned yet. Has the office been cleaned?
The office will be cleaned next week. The office won't (will not) be cleaned next week. Will the office be cleaned next week?
The office can be cleaned. The office cannot (can't) be cleaned. Can the office be cleaned?
When we want to include the agent (who), we use a prepositional phrase with by:
The play was written by Oscar Wilde.
Passive forms – common mistakes
Common mistakes Correct version Why?
This problem will solved next week. This problem will be solved next week. To make a passive form we use be + past participle.
This problem will be solve next week. This problem will be solved next week. To make a passive form we use be + past participle.
My car is repairing at the moment. My car is being repaired at the moment. To make a passive form of a continuous tense we use be + being + past participle.
She has be invited. She has been invited. To make a passive form of the perfect tense we use have/has/had + been + past participle.