We stayed up late night and we were so tired -> If...

$\text{We stayed up late night and we were so tired}$

$\longrightarrow$ $\text{If we didn't stay up late at night, we wouldn't be so tired.}$

$\longrightarrow$ $\text{Câu điều kiện loại 2}$

$\longrightarrow$ $If + S + V2/ Ved, S + Would/ Could/ Should… + V$

$\longrightarrow$ $If + QKĐ,  HTĐ/HTTD$

$\longrightarrow$ $\text{If this thing happened that thing would happen.}$

$\longrightarrow$ $\text{To be: were/weren't}$