$\text{*Công thức chung:}$
`I`.Thì Hiện tại hòan thành:S+Has/Have+Vpp
`II`.This/It is the first time+S+Has/Have+Vpp
`III`.S+Has/Have+Never+Vpp+Before
`IV`.S+Has/Have+(not)+Vpp+Before
`V`.Thì Qúa Khứ Đơn:S+V(ed/2)+ago.....
`1`.We have been looking for a flat for two months
`2`.I haven't been to a night club before
`3`.This is the first time they have heard such a thing
`4`.This is the first time I have met her
`5`.It has rained since 2 o'clock.
`6`.It is the first time I have been to the ballet
`7`.It is the first time I have met such a famous person
`8`.It is the first time she has seen that boy here
`9`.It’s 8 years since she learned E(It's+Khoảng thời gian+Since+S+V(ed/2)
`10`.We started to learn E four years ago(S+Started+V_ing/to-inf)
`11`.Ly's father has stopped smoking since last year
`12`.When did you learn Spanish?(How long have (you)⇄When did (you)
$\text{@TriLeCongTri}$
$\text{chúc em học tốt!!!!!!!}$