What languages are described by the following REs?

$($i$)$ a$($a$|$b$)*$b$($ii$)($aa$)*$a$($iii$)($a$*|$b$*)*$

$($iv$)($a$|$b$)*($c$|$d$)*($v$)((\backslash$epsi $|$b$)$a$*)*($vi$)$ aab$($a$|$b$)*$

$($bb$|$aa$)$