A means “one of many, not yet identified”, while the means “that particular one”, when the listener knows which one you mean. I saw a dog: some dog that hasn't been mentioned before. The dog was huge: the same dog that has already been mentioned. The is also used when there is only one such thing in the situation and it's obvious which: Close the window, please.
a or the — can you pick the right one?
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a/an + singular noun (new for the listener); the + noun (the listener knows which one); a … on first mention → the … on second mention; Is there a + noun?; Where is the + noun?
- I bought a new laptop last month, but the battery already needs replacing.
- Excuse me, is there a pharmacy near the hotel where we're staying?
- We stayed in a small hotel by the sea, and the owner cooked breakfast for us every morning.
What changed
First versionYesterday I found the nice café near my office.
RevisionYesterday I found a nice café near my office.
It's tempting to use the because you know which café you mean. But what matters is whether the listener knows it. The café is being mentioned for the first time, so for the listener it's still just some café, and you need a. The comes later: The coffee there is great.
Compare two questions. In Is there a bank near here? you're asking whether there is any bank nearby at all. In Where is the bank? you already know there is a bank and are looking for that particular one.
Your turn
I've got two tickets for a concert on Saturday. ___ concert starts at eight, so let's meet at seven.
Show the answer
The — The concert has already been introduced in the first sentence: a concert on Saturday. The second sentence is about the same concert, and the listener knows which one, so The. A concert would sound like a different concert.
Write about a place you've discovered recently: a café, a shop or a park. Mention it for the first time with a, then say something about it with the.
Last month I discovered a tiny café near my office. The café only has five tables, but the coffee is the best in town.
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