Indefinite articles A - AN

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With the meaning one.	I have a sister and two brothers.
In expressions of measurements.	60 kilometres an hour. This cloth costs 2€ a metre. We have lessons three times a week.
Before dozen, hundred, thousand, million.	A hundred cows were in the field.
Before singular nouns, denoting a profession, religion or class ...	Peter is an engineer. He was a Muslim not a Christian. Is he a Socialist politician? BUT Dr. Johnson was Professor of English at Cambridge.
Descriptions.	This man had an angry look.