1. My sister can swim well. She can't play badminton. (but)

→ My sister can swim well but she can't play badminton. . 

2. Hanh goes to that French restaurant every week. She loves French food. (so)

→ Hanh loves french food so she goes to that french restaurant every week.

3. He was tired last night. He stayed up late to watch a football match. (although)

→ Although he was tired last night, he stayed up late to watch a football match. 

4. I don't like this TV programme. It's so boring. (because)

→  I don't like watch news because it is boring.

5. My mum went to Hue last month. His mum went to Hue last month, too.(and)

→ My mum and his mom went to Hue last month.

6. He was lazy, so he got a bad mark. ( “because”)

→ He got a bad mark because he was lazy.

7. It rained hard yesterday. I went to school on time. (“although”)

→ Although it rained hard yesterday, I went to school on time.

8. Lan is more beautiful than all girls in her class. (most )

→ Lan is the most beautifull girl in her class.

9. Daisy has to do her homework. She is very tired . ( “Although”)

→ Although Daisy is very tired, she has to do her homework.

10. I am interested in the history of television, so I’ve read a lot of books about it.

→ Because 

11. Hien is a careful driver.

- Hien drives carefully.

12. Nga likes badminton most.

- Nga’s favorite is badminton.

13. No planet in the Solar System is as big as Jupiter.

-Jupiter is the biggest planet in the Solar System.

14. The children look so healthy.

→ What healthy children!

15. We tried our best to play well. We didn’t win the match.

→ We didn't win the match although we tried our best to play well.

16. Susan likes swimming most.

- Susan’s favourite sport is swimming.

t1 . My sister can swim well she can't play badminton ( but )
=> My sister can swim well but she can't play badminton

2 . Hanh goes to that friench restaurant every week . She loves french food ( so )
=> Hanh goes to that french restaurant every week so she loves french food

3 . He was tired lastnight . He stayed up late to watch a football match ( although )
=> Although he was tired lastnight he stayed up late to watch a football match
4 . I don't like this TV programme . It's so boring ( because )
=> I don't like this TV programme because it's so boring
5 . My mun went to Hue last month . His mun went to Hue last month ( and )
=> My mun went to Hue last month and his mun went to Hue last month

6. He was lazy, so he got a bad mark. ( “because”)

=>He got a bad mark because he was lazy.

7. It rained hard yesterday. I went to school on time. (“although”)

=> Although it rained hard yesterday,i went to school on time

8. Lan is more beautiful than all girls in her class. (most )

=>8. Lan is most beautiful girls in her class. 

9. Daisy has to do her homework. She is very tired . ( “Although”)

=> Although Daisy is very tired, she has to do her homework.

10. I am interested in the history of television, so I’ve read a lot of books about it.

=>Because I was interested in the history of television so I read many books about it.

11. Hien is a careful driver.

=> Hien drives carefully.

12. Nga likes badminton most.

=> Nga’s favorite is badminton.

13. No planet in the Solar System is as big as Jupiter.

=>Jupiter is the biggest planet in the Solar System.

14. The children look so healthy.

=> What healthy children!

15. We tried our best to play well. We didn’t win the match.

=> We didn't win the match although we tried our best to play well.

16. Susan likes swimming most.

=> Susan’s favourite sport is swimming.