Active - Pasive

Simple Present.
Active : Bobi writes a letter.
Pasive : a letter is written by Bobi.

Present Continuous.
Active : Dina is cutting a letter now.
Pasive : a letter is being cuttten by Dina.

Present Perfect.
Active : Sinta has written a letter.
Pasive : a letter has been written by Sinta.

Simple Past.
Active : The Children watched the TV.
Pasive : The TV was watched.

Past Continuous.
Active : My Sister was cleaning the windows.
Pasive : The windows were being cleaned.

Past Perfect.
Active : She had kept the novel
Pasive : The novel had been kept

Future
Active : I will write a book.
Pasive : a book will be written.

Aktif ke Pasif adalah perubahan kalimat aktif ke pasif dengan merubah objek menjadi subjek kemudian to be ditambah Verb 3.

sumber : http://zulyantoari.blogspot.com/2013/06/active-pasive.html