1.b> , ; (.i> , , . i>); she's too vain to wear glasses , ; ; he's so vain he looks in every mirror he passes : , ;
2.b> , ; , ; they made vain attempts to save her / ; I knocked loudly in the vain hope that someone might answer , ;
in vainb> ; , ; the firemen tried in vain to put out the fire / ; all our efforts were in vain / .