1 Do we use the passive when it's important who does something? yes / no
2 Do we use the past participle of the main verb in a passive sentence? yes / no
3 Which is correct? Computers are made here. / Computers made here. / both
4 Do we use in after the passive to say who does or did something? yes/no
5 Do we use by when we don't know who does or did something? yes / no
6 Which is correct? These were made by Joe./These were made in 1991./ both

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