`1`. Because Mary was sick, she couldn't go to school.
`->` Because + S + V : bởi vì `=>` chỉ nguyên nhân
`2`. I haen't met him for 3 years.
`->` The last time + S + V2/ed + was + thời gian + ago = S + have/has + not + Vpp + for + thời gian
`3`. Lan finished her homework, so she went out.
`->` so + S + V : vì vậy `=>` chỉ kết quả
`4`. He likes/ loves doing morning exercises.
`->` like / love + Ving = be interested in + N/Ving