1. Although Jack has a new laptop, he never logs on his account on the Facebook.

- Clause 1 (S + V + O); however, Clause 2 (S + V + O): tuy nhiên

-> Although + Clause 1 (S + V + O), Clause 2 (S + V + O): Mặc dù

2. Because Lan wants to study better, she turns off her mobile phone.

- Clause 1 (S + V + O), so + Clause 2 (S + V + O): vì vậy

-> Because + Clause 1 (S + V + O), Clause 2 (S + V + O): Bởi vì

3. Because Tuan is hard, he often gets good marks on exams.

- Tương tự câu 2

4. My friend bought a lot of books because he likes reading.

- Clause 1 (S + V + O), for + Clause 2 (S + V + O)

-> Clause 1 (S + V + O) + because + Clause 2 (S + V + O): bởi vì

5. Although Quan is a club member, he never participates in any activities.

- Tương tự câu 1

6. Because Phong didn't study hard, he didn't pass the entrance exam.

- Tương tự câu 2

7. Nam is keen on checking the notifications and seeing some new posts.

- like + V-ing = be keen on + V-ing: thích làm gì đó

- Thì HTĐ: (+) S + is/am/are + N/Adj

8. Tuan teaches English better than Huy.

- S + tobe + a/an + adj + N -> S + V + adv

- So sánh hơn: Với trạng từ ngắn: S1 + V + adv + -er + than + S2

9. Alex is interested in chatting with his friends on Facebook Messenger.

- love + to V = be interested in + V-ing: thích làm gì đó

- Thì HTĐ: (+) S + is/am/are + N/Adj