1. If you don't hurry up, we will miss the bus.

2. Viet got wet because he forgot his raincoat.

3. My brother is a good guitarist.

4. If you study harder, you will pass the examination.

5. Because Tom was lazy, he failed the exams.

6. If we don't reduce the use of water and electricity, we'll have to pay more this month.

7. Lan studies English well.

8. The river is very dirty because people throw trash onto the water.

9. It took me ninety minutes to do the exercises.

10. If you don't work hard, you won't pass the exam.

11. If you do morning exercise ,you will be healthy.

12. I haven't seen her for 3 years.

1. Hurry up or we will miss the bus.

---> If you don't hurry up, we will miss the bus.

2. Viet forgot his raincoat, so he got wet.

----> Viet got wet because he forgot his raincoat.

3. My brother plays the guitar well.

-----> My brother is good at playing the guitar

4. Study harder and you pass the examination.

------> If you study harder, you will pass the examination.

5. Tom failed the exams because of his laziness.

--------> Because Tom was lazied, he failed the exams

6. Unless we reduce the use of water and electricity we'll have to pay more this month.

-----> If we reduce the use of water and electricity, we'll have to pay less this month.

7. Lam is very good at English.

-------> Lan studies English very well

8. People throw trash onto the water, so the river is very dirty.

--->The river is very dirty because people throw trash onto the water.

9. I spent ninety minutes doing the exercises.

---> It took me ninety minutes to do the exercises.

10. Work hard or you won't pass the exam.

---> If you don't work hard, you won't pass the exam.

11. Doing morning exercise or you will be unhealthy.

-----> If you do morning exercise, you will be healthy.

12. I last saw her three years ago.

----> I haven't seen hers for three years.