Model answer
Written by 8020 teachers. Do not memorise it — take the structure and the way ideas are developed, then speak about your own life.
I'll talk about a secondhand bicycle I bought about six weeks ago, which wasn't something I'd been planning for very long, more something I decided fairly suddenly after my commute became unbearable on the bus. I found it through a listing online, from a man clearing out his garage after moving house, and went to look at it in person mostly to check it wasn't falling apart, since buying anything secondhand always comes with a slight risk you're inheriting somebody else's problem. I bought it, in short, because the maths made sense — the bus fare alone would've paid for the bike within about four months, and I liked the idea of arriving at work having actually done something rather than just sitting there getting more irritated by delays. Whether I'm happy with it is an easy yes, though not without a small asterisk — it needed a new set of brake pads almost immediately, which the seller conveniently hadn't mentioned, so there was a bit of unexpected cost right at the start. Past that initial hiccup, though, it's honestly transformed my mornings; I get to work faster than the bus ever managed, I arrive slightly more awake, and there's a small but real sense of satisfaction in having solved an annoying daily problem with one reasonably cheap decision instead of just complaining about it indefinitely, which is what I'd been doing for months beforehand.