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Used before a singular countable noun when you mention it for the first time or do not mean a particular one.

• I saw a dog in the garden.
  Bahçede bir köpek gördüm.
• Is there a bank near here?
  Buralarda bir banka var mı?

Used before a noun to say what kind of person or thing someone or something is, such as a job.

• My sister is a nurse at the city hospital.
  Kız kardeşim şehir hastanesinde hemşire.
• That was a really good film.
  Gerçekten güzel bir filmdi.

Used to mean each or every with prices, rates and periods of time.

• I brush my teeth twice a day.
  Dişlerimi günde iki kez fırçalarım.
• We go swimming three times a week.
  Haftada üç kez yüzmeye gideriz.

Used to mean any member of a group, when saying what is true of every member.

• A good teacher always listens to the students.
  İyi bir öğretmen öğrencilerini her zaman dinler.
• A cat can see well in the dark.
  Kedi karanlıkta iyi görebilir.

Used to mean one, especially with numbers, amounts and periods of time.

• The house is about a hundred years old.
  Ev yaklaşık yüz yaşında.
• I'll be back in a minute or two.
  Bir iki dakikaya dönerim.

Used in expressions of quantity such as a few, a little, a lot of and a bit.

• I have a few questions about the homework.
  Ödevle ilgili birkaç sorum var.
• Could I have a little more tea, please?
  Biraz daha çay alabilir miyim, lütfen?

Used after what and such to express a strong feeling about something.

• What a beautiful view from your balcony!
  Balkonunuzdan ne güzel bir manzara!
• You have such a lovely garden, Mrs Kaya.
  Öyle güzel bir bahçeniz var ki, Kaya Hanım.

Used before a drink or dish to mean one cup, glass or portion of it.

• Can I get you a coffee before we start?
  Başlamadan önce sana bir kahve getireyim mi?
• Two teas and a hot chocolate, please.
  İki çay ve bir sıcak çikolata, lütfen.

Used before a person's name to show that the speaker does not know that person.

• A Mr Demir called while you were out.
  Sen yokken Demir Bey adında biri aradı.
• There's a Ms Yılmaz here to see you.
  Sizi görmek isteyen Yılmaz Hanım adında biri var.