Is each spring system harmonic, underdamped, critically damped, or overdamped?

$2$s $($t$)+3$s $($t$)+5$s$($t$)=0$

$2$s $($t$)+4$s $($t$)+$ s$($t$)=0$

$2$s $($t$)+5$s$($t$)=0$

$2$s $($t$)+8$s $($t$)+8$s$($t$)=0$