1.she has been sick since wednesday

2.nam's father has worked in this company for 20 years 

3.recently, life in our province has changed dramatically 

4.At this time next week, we will study english grammar

5.we study almost every lesson in this book so far

6.they will replace nuclear power in the future

7.How long has you learn English?

8.when i got up this morning , my mother has already leaf

9.they will travel to hcm city at this time next month

10.the flight number 781 to melbourne will arrive at 9 o'clock tomorrow morning 

11.this time next week , i will sit on the beach in nha trang

12.i have collected stamps since i was a child 

13.mr park has just walked along the street when he saw the accident 

14.he has collected stamps since i was a child

15.when you come tomorrow , i will do my homework 

16.she hopes she will study hard to pass the exam 

17.look at the dark cloud it is going to rain 

18.have they catch any fish yet ?

19.he reads book for 2 hours

20.lan saw high school musical before

Chúc bạn học tốt ^_^!!!
(Nếu thấy hay hãy vote 5*,cảm ơn và bình chọn là câu trả lời hay nhất để mik có động lực giải tiếp các BT khác nhé!) 

1.has been

2. has worked

3. has changed

4.will study

5. study

6.will replace

7.How long are you learn English 

8.has already leaf

9.will travel

10.will arive

11.will sit

12. have collected

13.has just walked

14.has collected

15.will do

16.studies

17. is going to rain

18.have they catch

19. read

20.saw