$\text{@su}$

`6`, He started to play the piano five years ago.

(start + to V / V-ing : bắt đầu làm gì)

`7`, Tim was hungry because he had not eaten all day.

(because + clause : bởi vì...)

`8`, While I was opening the letter, the bell rang.

(cấu trúc "hành động chen ngang)

`9`, It snows quite much in Britain during the winter.

(miêu tả hành động hoặc sự việc thường xảy ra vào 1 thời điểm nhất định)

`10`,  They were the poorest people I had ever seen.

(S1 + tobe + the adj-est/most adj + S2 + have/has/had + ever + P2)

$\text{#BTS}$

`6)` He started to play the piano five years ago.

- S + started/began/finished + to V/V-ing + ... + time + ago

`7)` Tim was not hungry because he had eaten all day.

- Thì QKHT

`8)` While I was opening the letter, the telephone rang.

- While + S + was/were + V-ing + ...,S + V2/V-ed + ...

`9)` It snows quite much in Britain during the winter.

`10)` They were the poorest people I had ever seen.

- S + be + the + adj/adv + "-est" + I have/has/had + ever + VpII