`-` CĐK Loại 1 ( `1 - 3` ) :

If - clause : Thì HTĐ : S + Vs / es / không s , es

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

`1`.If we don't protect the environment , we will destroy ourselves

`2`.If she isn't more hard-working , she will get low marks

`3`.If he doesn't listen to his parents , he will fail

`4`.They have watched the movie for one hour

`\rightarrow` Thì HTHT : S + have / has + V3 / PII

`\rightarrow` Đặc điểm nhận dạng : for

`5`.He has not cried for ten years

`\rightarrow` Thì HTHT ( CPĐ ) : S + haven't / hasn't + V3 / PII

`\rightarrow` Đặc điểm nhận dạng : for

`\text{@ TheFox}`