we couldn't do the test.It was very difficult (so)

my mother woke me up early. She wanted me to have breakfast (since)

he failed the exam. He was very lazy (so)

`1.` The test was so difficult that we couldn’t do it.

`-` Cấu trúc: S `+` be/V `+` so `+` adj/adv `+` that `+` S `+` V

`->` ... quá ... đến nỗi mà ...

`C2:` The test was very difficult, so we couldn't do the it.

`-` Cấu trúc: S `+` V `+` ,so `+` S `+` V 

`->` So (vì vậy) `+` mệnh đề kết quả.

`2.` My mother woke me up early since she wanted me to have breakfast.

`=` Since my mother wanted me to have breakfast, she woke me up early.

`-` Since/As/Because (bởi vì, vì) `+` mệnh đề nguyên nhân `-` kết quả.

`->` S `+` V `+` since/as/because `+` S `+` V 

`=` Since/As/Because `+` S `+` V, S `+` V

`3.` He was so lazy that he failed the exam.

`-` Cấu trúc: S `+` be/V `+` so `+` adj/adv `+` that `+` S `+` V

`->` ... quá ... đến nỗi mà ...

`C2:` He was very lazy, so he failed the exam.

`-` Cấu trúc: S `+` V `+` ,so `+` S `+` V 

`->` So (vì vậy) `+` mệnh đề kết quả.

`1` The test was very difficult so we couldn't do it.

`2` My mother woke me up early since she wanted me to have breakfast.

`3` He was very lazy so he failed the exam.

`----------`

`-` S + V + so + S + V: vì vậy

`=` Because/Since/As/For + S + V, S + V: Bởi vì

`->` Diễn tả hai vế chỉ nguyên nhân `-` kết quả.