5, I began studying english three years ago .
công thức
S+began/started + V_ing / to V+O
6,It is five years since my brother last saw his best friends
công thức
It is + thời gian + for/since+S+V(ed/BQT2)+O
7, How long have you started learning English?
công thức
How long + have/has+S+V(ed/BQT3)+O
8,We have lived here fifteens for years
công thức
S+have/has+V(ed/BQT3)+O
9,She hasn't visited me for five years
công thức
S+haven't/hasn't+V(ed/BQT3)+O
10,I haven't writen to my uncle since July
công thức
S+haven't/hasn't+V(ed/BQT3)+O
