4 Choose the correct answer. 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