1. If we work hard, we will succeed 

2. Hurry up or you will be late for school 

3. If Peter doesn't eat too much, he won't be overweight 

4. If people don't leave the door open, the office won't be cold

5. I suggest these walls should be painted white instead of green 

6. Because of her laziness, she failed in the exam

7. They don't go abroad because they're afraid of flying

😊

`=>`

1. Hard work leads us to success.

`->` If we work hard, we will succeed.

2. If your hurry up, you won't be late for school.

`->` Hurry up or you will be late for school.

3. Peter is overweight, he eats too much.

`->` If Peter doesn't eat too much, he won't be overweight.

4. The office is cold. People leave the door open.

`->` If the office is cold, people will leave the door open.

5. Why dont we paint these walls white instead of green?

`->` I suggest these walls should be painted white in stead of green.

6. She failed in the exam because she was lazy.

`->` Because of her laziness, she failed in the exam.

7. If they're not afraid of flying, they will go abroad.

`->` They will go abroad because they are not afraid of flying.

Giải thích các bước giải:

1, 3, 4. Cấu trúc câu điều kiện loại 1:

If + S + `V_{HTĐ}`, S + will + V(inf).

2. Cấu trúc: `S_1` + `V_1` + `O_1`, or `S_2` + `V_2` + `O_2`.

5. Cấu trúc: S + suggest + V_ing/N + O.

6. Cấu trúc: Because of + N/pronoun (đại từ làm tân ngữ)/V_ing + O, S + V + O.