$\text{1. They HAVE just DECIDED to buy a new house.}$

$\text{2. "Gone with the Wind" is the most interesting film we HAVE SEEN recently.}$

$\text{3. DID you see Nam last Sunday?}$

$\text{- Oh, no I HAVEN'T SEEN him for many days now.}$

$\text{4. Since when you LEARNT/LEARNED E?}$

$\text{- I LEANT/LEARNED it since I AM a girl of twelve}$

$\text{5. HAVE you ever BEEN to HCM city?}$

$\text{- No, I HAVEN'T BEEN there yet, but my parents HAVE BEEN there twice this year.}$

$\text{6. They HAVE DONE nothing since they GOT up}$

$\text{7. My brother JOINED the army when he WAS 18}$

$\text{- He HAS SERVED in the army for 3 years and then WENT to university}$

$\text{8. How long you LIVED in this town?}$

$\text{- I LIVED in this town for 10 years.}$

$\text{9. My sister FINISHED school in 1997 and was a student at the National University since then.}$

$\text{My parents HAVE GONE out. They'll be back soon.}$

1. have just decided

2. have seen

3. Did you see; haven't seen 

5.learnt; have learnt; was 

5. Have you ever been; haven't been; have been 

6. have done; got 

7. joined; was; has served; went 

8. have you lived; have lived  

9. finished; has been

10. have gone