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1. This bridge has been built for 4 months
2. This film has been broadcasted since last year
3. This exercise has been done for 2 hours
This bridge has built for 4 months
This film has broadcast since last year
This exercise has done for 2 hours
1/ will be
2/ is going to go
3/ told
4/ lived
5/ have been
6/ have visited
7/ has worked
8/ have been
9/ watchs
10/ used to
1. Ba has done his homework for 1 hour.
2. She has written to home for 3 weeks.
1.Ba (do) _has done_ his homework for 1 hour.
2.She (write) _has wrtten_ to him for 3 weeks.
1 has been
2 hán't had
3 hasn't played
4 haven't had
5 haven't seen
6 have - realized
7 has finished
8 have you known
9 Have you taken
10 Has - eaten
11 have lived
12 has - left - has left
13 have bought
14 has written
15 have finished
32. Tom is strong so he can lift that heavy table
33. Nam's father used to drink a lot of wine
34. We have been in Sapa for 2 years
35. l don't mind to help you repair the radio
36.He climbed a tree in order to get a better view
37. Did Jame Watt invent the steam engine?
38. This is the first time she has seen a more unusal festival than this
39. An important experiment is being carry out by the scientists
40. Cheese is made from milk
CHÚC EM HỌC TỐT NHÁ 
chủ ngữ they thì bỏ cũng được không bỏ cũng không sao =))
^^ k có gì!
I think is for