1.when did you buy it
how long....................................................
2.when did you last ride a bike
how long ...............................................
3.when was the last time you saw mary
how long................................................
4.how long have catherine and henry been egaged
when did.................................................................
5.how long is lt since you last saw mary
when...................................................
6.l bengan living in ho chi minh city when l was 8
l have..................................................................
7.she strarted driving one years ago
she has..........................................................
8.we began eating whe in started rainning
we have.....................................................
9. l started working for the company a year ago
l have been .....................................................
10.she has been working for this company for 6 year
she started...............................................................
11.we started learning english five year ago
we have.............................................................
12.she started working as a secretary 5 years ago
she has....................................................................
13.she has taught the children in this remote village for five months
she started.....................................................................................
14.samuel started keeping a diary in1997
samuel has