`1`. John had finished the report before he went to bed

vì:

Ta có:

QKHT+before+QKĐ

QKHT:
S+had+V(PII)+....

QKĐ:
S+V(ed)+....

`2`. The last time since I was to the seaside was six months ago

vì:

Ta có:

The last time since+S+V(ed)+.....+was+thời gian

`3`. Mary has worked in this company for 5 years

vì:

Ta có công thức:

S+has/have+V(PII)+.....

= S+began+to V(inf)+.....

Mary là số ít nên dùng has

$#Nu:)))$

`1`/  John had finished the report before he went to bed

`=>` Ta dùng quá khứ hoàn thành nói về `1` chuyện diễn ra trước `1` chuyện trong quá khứ

`(+)` S + had + Vpp + .......

`2`/  The last time since I was to the seaside was six month ago.

`=>` Ta có cấu trúc: The last time since + S+V2 / ed +.....+ was / were + .......

`3`/ Mary has worked in this company for 5 years.

`=>` `1` việc diễn ra trong quá khứ tới giờ vẫn chưa kết thúc thì dùng hiện tại hoàn thành

`(+)` S + have / has + Vpp + .........

Mary + has