Pola umum kalimat aktif yang dapat diubah menjadi kalimat pasif adalah S + V (sesuai tense) + O. Untuk mengubah kalimat aktif ini menjadi kalimat pasif, ada tiga langkah yang harus kita lakukan. Pertama, kita tukar posisi obyek O dan posisi subyek S. Kedua, kita tambah preposisi by sebelum subyek S. Ketiga, kita ubah V menurut pola 'be + V3' dengan tetap memperhatikan tense ketika menulisnya.
Beberapa contoh perubahan kalimat aktif menjadi kalimat pasif serta pola V pasif 'be + V3' sesuai setiap tense adalah sebagai berikut:
1. Simple Present Tense:
Aktif: My father plants a flower.
Pasif: A flower is planted by my father. (am, are, is + V3)
2. Present Continuous Tense:
Aktif: My father is planting a flower.
Pasif: A flower is being planted by my father. (am, are, is + being + V3)
3. Simple Past Tense:
Aktif: My father planted a flower.
Pasif: A flower was planted by my father. (was, were + V3)
4. Past Continuous Tense:
Aktif: My father was planting a flower.
Pasif: A flower was being planted by my father. (was, were + being + V3)
5. Present Perfect Tense:
Aktif: My father has planted a flower.
Pasif: A flower has been planted by my father. (has, have + been + V3)
6. Past Perfect Tense:
Aktif: My father had planted a flower.
Pasif: A flower had been planted by my father. (had been + V3)
7. Simple Future Tense:
Aktif: My father will plant a flower.
Pasif: A flower will be planted by my father. (will be + V3)
Jadi, jawaban yang tepat adalah "To change active voice to passive voice, first we switch the positions of the subject and object of the active sentence. Second, we add the preposition "by" before the subject. Third, we change the verb to the 'be + V3' pattern according to the tense of the sentence".