1The death Fish are floating in the water.
2 if lan wasn't ill, she will join our tree planting activity
3 if we don't waste paper,we will safe thousands of trees
4 they have been maried for nearly 20 year.
5  i have two weekes off on kate festival 
6 if we don't waste ,papre, we will save thoiusands of trees
7 if i were you, i would looked for a new place to live
8 i have learnt English since 2015
Bai 2.
1 the water is poouted, so the fish aer dead.
Because the water is polluted, the fish are dead.
2 Because the weather was bad, i didn't go to school.
Because of the bad weather, i didn't go to school.
3 she doesn't have free time, so she can't visit her grandparenst.
If she had free time,she could visit her grandparents
4 lan was sick, so she didn't go to school.
Because lan was sick, she didn't go to school.
5 Because the water is polluted, the fish are dead.
Because of the water pollution, the fish are dead.
6. Lan doesn't have free time, zo she can't go to the cinema

if lan had free time,she could go to the cinema

1. dead

2. will join

3. will save

4. have been

5. festival

6.don't waste

7. would look

8. have learnt 

bài 2.

1. Because the fishes are dead, the water is polluted

2. Because of the bad weather, I didn't go to school

3. If she had free time, she could visit her grandparent

4. Because Lan was sick, she didn't go to school

5. Because of the polluted water, the fishes are dead ( đề sai are thì fishes chứ )

6. If Lan had free time, she could go to the cinema

Because of not having free time, she can't go to the cinema

Chúc em học tốt!