46. She has been studying English since 2017.

- S+ have/have+ PII/ been Ving+ since+ mốc thời gian. 
- Câu này viết là has studied ... cũng được nhưng mình muốn nhấn mạnh thời gian thì mình dùng has been studying.

47. It is very important to keep the environment clean.

- It+ be+ adj+ (for sb) + to V: thật... để (ai) làm gì.

48.  Unless you take care of those shoes, they won't last for long.

- Unless= If...not: nếu ....không

49. She said that she came from Japan.

- Câu gián tiếp: S+ said/ told...+ (that)+ S+ V(lùi thì)

50. Because Thanh was tired, she went to bed early last night.

- Because + clause= Because of+ Ving/ N(s/es)

1. she has studied English since 2017.

2. It’s very important to keep the environment clean

3. Unless you take care of those shoes, they won't last for long.

4. she said that she came from Japan.

5. Because Thanh was tired, she went to bed early last night.

Chúc chủ tus học giỏi điểm cao nhé ^^

#NOCOPPY :)))