1. If/people/not/stop/dumping/waste/into/rivers/,/pollution/increase/.

=> If people don't stop dumping waste into rivers, water pollution will increase

2. If/polar/ice caps/melt/,/huge landmasses/ be/under/water.

=> If polar ice caps melt, the huge landmasses will be under the water

3. If the air,/in/city/be/polluted/,it/can/cause/peole's/respiratory/problems.

=> If the air in the city is polluted, it could be the cause of people's respiratory problems

4. If/smog/be/frequently/formed/in/city/,/it/cause/dificulty/in/breathing/headache/even/lung cancer,

=> If smoking is frequently formed in the city, it can cause difficulty in breathing problems, headaches and even lung cancer.

5. If/ carbon monoxide/concentrate/in/great/amounts/,/it/be/ harmful.

=> If the amount of carbon monoxide concentration in the great lungs is too large, it will be very harmful

6. The climate/change/if/more trees / be /cut/down/for/hardwood/.

=> The climate will be changed if more trees are cut down for hardwood

7. If/we/not/control/pollution/soon/,/it/be/too/late.

=> If we don't control pollution soon , it will be too late

4.If smog is frequently formed in the city, it will cause difficult breathing or even lung cancer.

dịch: Nếu khói bụi thường xuyên được hình thành trong thành phố, nó sẽ gây khó thở hoặc đau đầu thậm chí ung thư phổi.

 câu đk loại 1: If + S + Vo, S + will/model verb +.....