... perfect1. Hành động xảy ra sau trong 2 hành động trong q khứ . 2. BEFORE/ BY THE TIME/ UNTILL+ S +V2.3. Dùng trong mệnh đề (if – type 2, wish- type 2, if only, as if, as though) diễn tả ... recently. 12. - A: You (see) Nam last Sunday? - B: Oh, no. I (not to see) him for many days now.13. - A: Since when you (learn) English? - B:I (learn) it since I (be) a girl of twelve.14. - A: ... THE TIME/ UNTILL+ S +V2. 2. S + V2 + WHEN/ THAT/ AFTER/ AS SOON AS + S + HAD + V3.3. S + HAD + NO SOONER + V3 + THEN + S +V2. 4. S + HAD + HARDLY + V3 + WHEN + S + V2. - He had already gone...