Articles: a/an, the, and no article

Use a or an for one person or thing on first mention and for singular jobs; choose by consonant or vowel sound; Use no article for plural things in general, personal names, cities, streets, most countries, days, times and meals; Use the for known or already mentioned things, clearly specified things and unique places or objects; Use the in phrases such as the city centre and in the morning, but use no article in at night.