... - was building) a house in 199 5.50. Green (teach) English in this school since he (graduate) from this university in 198 6.……………………………………………………………………… 51. Yesterday, Hoa and her aunt (go) to ... V1?S +have /has + V3 S + haven’t /hasn’t + V3Have /Has + S + V3?Yesterday, ago, last… Yesterday: / In 197 9 < now, First, later, then, after that, finally, at last:Since: / For: So ... from the farm on them .……………………………………………………………………… 53. When ……………you ………. (buy) this dress? –Tow days ago.……………………………………………………………………… 54. Why (be) you absent from school yesterday?.………………………………………………………………………...