|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.