Match the following parts of the sentences
a) 1. Sam was planting trees...
2. Sam plants trees...
3. Sam will plant trees...
4. Sam is planting trees...
5. Sam would plant trees...
6. Sam had planted trees...
7. Sam has planted trees...
8. Sam planted trees...
9. Sam will be planting trees...
10. Sam has been planting trees...

11. ...if the weather is fine
12. ...at this moment
13. ...since morning
14. ...two years ago
15. ...and now he is watering flowers
16. ...at 7 o`clock yesterday
17. ...eveery spring
18. ...at 5 o`clock tomorrow
19. ...if you helped him
20. ...before his mother asked him

b) 1. The house was being built...
2. The house will have been built...
3. The house was built...
4. The house has been built...
5. The house will be finished...
6. Had the house been built...
7. The house would be finished...
8. Having built the house...
9. The house is being built here...

11. ...everyday
12. ...we woukd have lived in a new flat
13. ...If we had necessary materials
14. ...they moved to another place
15. ...last year
16. ...in a few days
17. ...when i returned from army
18. ...this year
19. ...now
20. ...by the New Year