1. Number of people is this small area will be increase in next 20 years. (in next 20 years ⇒ TLĐ)

2. Solar energy will be considered one of the most important energy sources in the future. (in the future ⇒ TLĐ, Câu bị động TLĐ: S + will + V ... ⇒ S + will be + Vpp + (by O))

3. Your car runs faster than mine , doesn't it? (Câu hỏi đuôi: trước dấu phẩy là câu KĐ, sau dấu phẩy dùng PĐ)

4. New means of transport will be introduced in the future. (in the future ⇒ TLĐ, Câu bị động TLĐ: S + will + V ... ⇒ S + will be + Vpp + (by O))

5. Today there are less traffic than yesterday.

1. Number / people / this / small area / be / increase / quickly / next / 20 years. 

=> Number of people is this small area will be increase in next 20 years.

2. Solar energy / be / consider / one / most / important / energy sources / future. 

=> Solar energy is considered one of the most important energy.

3. Your car / run / fast / than / mine / not ? 

=> Your car runs faster than mine, doesn't it?

4. New / means / transport / be / introduce / future. 

=> New means of transport will be introduce in the future.

5. Today / there / be / little / traffic / yesterday. 

=> Today the are less trafic than yesterday.