4. The students will discuss the problem of natural disasters tomorrow.

→ The problem of natural disasters will be discussed by the students tomorrow.

⇔ Dạng bị động của ĐTKT: S + ĐTKT + be + V3/-ed

5. A volcanic eruption completely wiped out that island in the past.

→ That island was wiped out completely by a volcanic eruption in the past.

⇔ Dạng bị động của QKĐ: S + was/were + V3/-ed

6. Typhoons destroy more than 500 buildings and houses every year.

→ More than 500 buildings and houses are destroyed by typhoons every year.

⇔ Dạng bị động của HTĐ: S + am/is/are + V3/-ed

7. The firefighters put out the fire 2 minutes ago.

→ The fire was put out by the firefighters 2 minutes ago.

⇔ Dạng bị động của QKĐ: S + was/were + V3/-ed

8. Volcanic eruptions often attack Japan.

→ Japan is often attacked by volcanic eruptions.

⇔ Dạng bị động của HTĐ: S + am/is/are + V3/-ed