to be crazy about	miec swira
to get the bug for	zlapac bakcyla
to be obsessed with	miec obsesje
to get a taste for	nabrac checi
to give sth try	sprobowac czegos
to be into	wkrecony
to be keen on	bardzo cos lubic
a thing of the past	to juz przeszlosc
in thing	cos modnego
it's just one of those things	jest jak jest
one thing led to another	koniec koncow
the good thing is	dobrze sie sklada
the thing about	problem z