Setting the scene: The work for the day is done for the office workers. While they enjoy their evening, a group of other people sets out to work. They are the unknown cleaners of the building. Grammar: use of the passive in the present tense and how to build it. Recap conjugation of "werden". Review: participle to infinitive.Exercises: Write active sentences into the passive, without and with subject (von...)Homework: Transforming given active sentences with the impersonal pronoun into passive sentences. Write your own sentences, first in active and then in the passive voice. - DaF Arbeitsblätter