`1.` If people do not stop dumping waste into rivers, the pollution will increase.

`2.` If the polar ice caps melt, huge landmasses will be under water.

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

`4.` If smog is frequently formed in the city, it will cause dificulty in breathing, headache and even lung cancer.

`5.` If carbon monoxide concentrates in great amounts, it will be harmful.

`6.` The climate will change if more trees are cut down for hardwood.

`7.` If we do not control the pollution soon, it will be too late.

`8.` If we don't protect the frontier, we will suffer from many natural disasters.

Cấu trúc câu điều kiện loại I:

If + S + V(hiện tại đơn), S + can/ will/ may/... + Vnd

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

`->`  If people don't stop dumping waste into rivers, the pollution will increase.

- Câu điều kiện loại 1

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

`->` If the polar ice caps melt, huge landmasses will be under water.

- Câu điều kiện loại 1

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

`->` If the air in city is polluted, it can cause peole's respiratory problems.

- Câu điều kiện loại 1

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

`->` If smog is frequently formed in the city, it will cause dificulty in breathing, headache and even lung cancer.

- Câu điều kiện loại 1

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

`->`  If carbon monoxide concentrates in great amounts, it will be harmful.

- Câu điều kiện loại 1

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

`->` The climate will change if more trees are cut down for hardwood.

- Câu điều kiện loại 1

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

`->` If we do not control the pollution soon, it will be too late.

- Câu điều kiện loại 1

8. If/we/ not/ protect/ frontier/,/we/ suffer/ many/ from/ natural/ disasters.

`->` If we don't protect the frontier, we will suffer from many natural disasters.

- Câu điều kiện loại 1

- Công thức: If + S + V(s/es) + O,S + will/can/... + V-infi + O