EXERCISE 1:
1. will geese be given
2. live
3. goes the balloon (đây là đảo ngữ nha)
4. is
5. being
EXERCISE 2:
1. has Helen been doing - has been preparing - is dusting
2. are getting
3. came - were sitting - was doing - was knitting - were reading - smiled
EXERCISE 3:
1. would come - would bring
2. were looking - escaped
3. will have built - will be completed
4. started - were working
5. to have - built
6. started - have been watching
7. asking - never gives
8. told - will be doing
9. would have caught - had left
10. Not having - walked
11. being dried
12. to understand
13. wouldn't have become