`-` CĐK Loại `1` : Diễn tả hành động có thật ở Hiện tại

`+` If - clause : Thì HTĐ : S + Vs / es

`+` Main - clause : Thì TLĐ : S + will + V

`1`.If you don't study it , you won't understand it

`2`.Unless you study harder , you won't pass the exam

`3`.If we don't pollute the air , we won't have breathing problems

`4`.If you keep the water clean , the fish in this lake won't die

`5`.If you turn off all the lights here , you won't waste lots of electricty

`6`.If you are patient , you will pass the examination

`7`.If we plant more trees , the air won't be more polluted

`8`.If you water these trees , they won't die

`9`.If we leave now , we won't miss the plane

`\text{# TF}`

1. If you don't study it , you won't understand it

2. Unless you study harder , you won't pass the exam

3. If we don't pollute the air , we won't have breathing problems

4. If you keep the water clean , the fish in this lake won't die

5. If you turn off all the lights here , you won't waste lots of electricty

6. If you are patient , you will pass the examination

7. If we plant more trees , the air won't be more polluted

8. If you water these trees , they won't die

9. If we leave now , we won't miss the plane

*Kiến thức câu điều kiện loại 1 : If S + V hiện tại , S + will + V 

  -> Diễn tả sự việc có thể xảy ra ở hiện tại,tương lai 

  -> Unless = if not : nếu không