1.we have written a lot of e-mail on the computer in the pas

1.we have written a lot of e-mail on the computer in the past few years（改为被动语态）
问下have written是不是改成have been written为什么
2.as years have gone by ,computers have been made smaller and smaller.(改为主动语态）
3.they have reported refugees will be offered financial aid.
改成it____________refugees will be offered financial aid.
4.we have considered what the teachers and students require.
改为what the teacher and students require________
we have written a lot of e-mail on the computer in the past few years（改为被动语态） 这个也是问题之一。