SEQUENCE OF TENSES
1) Linh (work) ... for three different prestigious companies since she (graduate)... from university two years ago
2) when she (enroll) ... on the course, she had never studied a foreign language before
3) I (be) ... very angry when I (see) ... that my brother (eat) ... my apple
4) by the time I (move) ... in, they (finish) ... the building work
5) there (be) ... many changes around here since I (be) ... a boy
6) before we (reach) ... the station, we saw that we (lose) ... our way
7) the sun (shine) ... yesterday after it (be) ... cold for many weeks
8) uncle David (go) ... to the doctor after he (be) ... ill for a month
9) when i closed the door, i realized that i (leave) ... my keys inside
10) all the tickets (be) ... sold before the comcert (begin) ...