Passive

Use of Passive

Passive voice is used when the focus is on the action. It is not important or not known, however, who or what is performing the action

Present Passive

Am is are + Past Participle (+ by + noun)

Past Passive

Was Were + Past Participle (+ by + noun)

Personal and Impersonal Passive

Personal Passive simply means that the object of the active sentence becomes the subject of the passive sentence. So every verb that needs an object (transitive verb) can form a personal passive.

Example: They played a piano. – Played a piano.

Impersonal Passive: Verbs without an verb normally cannot form a personal passive sentence. If you want to use an intransitive verb in passive object intransitive voice, you need an impersonal construction

Example: he says – it is said

You can practice in the follow link:

http://www.englisch-hilfen.de/en/exercises_list/passiv.htm