5 I started learning English 3 years ago
III
1 If he watches too much television, he will hurt his eyes
2 If it isn't sunny tomorrow, we won't go to the beach
3 Teachers and classmates will come to support us at the beginning and the end of the match
4 It is the most beautiful landscape in VN I have ever seen
5 We didn't win the match last week because some good players didn't join
IV
1 first time I have ever been to Sa Pa
2 hanen't seen him since 2010
3 I have ever been to Da Lat
4 last time I visited
5 I have ever visited this beautiful place