僕の趣味は古いコインを集めることです。

僕: i, me, myself, servant, manservant
の: to, of
趣味: hobby, taste, interest, preference, liking, fondness, disposition, pastime
は: a, the, is, am, are, will
古い: old, ancient, outdated, aged, stale, antiquated, outmoded
コイン: coin, coins, token
を: o, the, to, wo
集める: collect, gather, to collect, to gather, attract, assemble, muster, garner
こと: that, thing, about, fact, matter
です: is, be, are, am, that, away