3 : When did your family begin to read Tuoi Tre's newspaper?
=> how long have.your family begun to read tuoi tre's newspaper..?

4 : When did he last take a photograph?
=> how long is it...?

5 : When did your father buy that car?
=> how long...has your father bought that car?

6 : When did she start preparting for her overseas study?
=> how long has...she been preparting for her overseas study?

7 : When did Mr Brown teach English at this school?
=> how long..has mr brown taught englishbat this school.?

8 : When did you last see him?
=> how long..have you seen him .?

9 : When did you start working in that factory?
=> how long..have you been working in that factory.?

10 : When was the last time you saw Mary?
=> how long...have you seen mary?

11 : How long is it since he started playing the piano?
=> how long..has he been playing the piano?

12 : When did both of you correspond with each other?
=> how long...have you corresponded with each other?

13 : How long ago did you last see Tom?
=> how long is it.since you last saw tom..?

14 : How long have you had that machine?
=> how long ago..did you have that machine.?

15 : When was the last time you watched an action movie?
=> when did..you watch an actim movie.?

3 : When did your family begin to read Tuoi Tre's newspaper?
=> how long have your family begun to read tuoi tre's newspaper..?

4 : When did he last take a photograph?
=> how long is it since he took a photograph?

5 : When did your father buy that car?
=> how long has your father bought that car?

6 : When did she start preparting for her overseas study?
=> How long has she prepared for her overseas study?

7 : When did Mr Brown teach English at this school?
=> how long has mr brown taught english at this school.?

8 : When did you last see him?
=> how long have you seen him ?

9 : When did you start working in that factory?
=> how long have you worked in that factory?

10 : When was the last time you saw Mary?
=> how long is it since you last saw mary ?

11 : How long is it since he started playing the piano?
=> how long has he played the piano?

12 : When did both of you correspond with each other?
=> how long have both of you corresponded with each other?

13 : How long ago did you last see Tom?
=> how long is it since you last saw tom ?

14 : How long have you had that machine?
=> how long ago did you have that machine.?

15 : When was the last time you watched an action movie?
=> when did you last watch an actim movie ?