I have learned how to swim since 2010.
2. She has worked for this bank since she leaves left the university.
3. How sweet voice you have!
4. I go to the school library to borrow books twice. 
5. Can you tell me the way to the post office? 
6. I received a letter from my friend last week.
7. I have been to Singapore three times.
8. My brother can't swim, because he is afraid of water.
9. Don't eat too much salt because it is not good for you.
10.- " What is the most expensive city in the world?" - "I think it's Tokyo."

Lỗi sai chủ yếu là chia động từ sai thì

=>Từ gạch chân là từ mình đã sửa đúng nhé.

$#nguyen$