The key to exercise solutions in chapter 5c - Grammar in use for the textbook On Screen B1+/B2 - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing
Question
Answer
a)
An active sentence follows the pattern of subject - verb - object while a passive sentence is subject - verb - agent. The object of the active sentence becomes the subject of the passive sentence. The verb of the active sentence takes on a passive form. The subject of the active sentence becomes the agent of the passive precedent by 'by' or it can also be omitted completely if the agent is unimportant or unknown.
b)
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