1. Letters were typed by Mary in the office

2.You will be helped by his father tomorrow

3. Human life has been changed completely by science and technology

4. This bottle was broken by Peter

1. Letters are typed by Mary in the office.

Cấu trúc câu bị động ở thì hiện tại đơn:

S + is/am/are + part participate + (by O)

2. You will be helped by his father tomorrow

Cấu trúc câu bị động ở thì tương lai đơn:

S + will be/ is\am\are going to be + part participate + (by O)

3. Human life has been completely changed by science and technology

Cấu trúc câu bị động ở thì hiện tại hoàn thành:

S + have/has + been + part participate + (by O)

4. This bottle was broken by Peter

Cấu trúc câu bị động ở thì quá khứ đơn:

S + was/were + part participate + (by O)