1, We used (write) to write to each other every month when we were aat secondary school
2, She asked me what I (do) to do then
3, Minh suggested that Linh (do) do morning exercises
4, Hoa (not live ) hasn't lived in Viet Tien since her father (do) did
5, Nga wishes she (be) were a tennis player
6,My sister enjoys (sing) singing karaoke
7, When he came home , her chidren (play) were playing chess
8, I don't have a villa . I wish I (have) had one
9, Have You (be) been to Singapore yet ?
10, He(not go) didn't go camping with his friends last week
11, Mary (work) has worked in this garage for more than 5 years
12, This work (do) was done by me yesterday
13,I wish I (can play) could play the guitar
14, While I was watching TV , my mother (do) was doing housework
15,A new bridge(build) will be built in this area next year