`1` Because they were lazy, they failed the exam.

`2` As she was kind, she missed the bus.

`3` Since Mary failed exam, her parents were very angry.

`-----`

`-` S + V, so + S + V: , vì vậy, vậy nên

`->` Because/Since/As + S + V, S + V: Bởi vì 

`1,` Because they were lazy, they failed the exam

`->` MĐ chỉ kết quả : S + V, so + S + V

`->` MĐ chỉ lý do : Because + S + V, S + V

`2,` As he was kind, she missed the bus

`->` MĐ chỉ kết quả : S + V. Therefore, S + V

`->` MĐ chỉ lý do : As + S + V, S + V

`3,` Since Mary failed exam, her parents were very angry

`->` MĐ chỉ kết quả : S + V, so + S + V

`->` MĐ chỉ lý do : Since + S + V, S + V