The word a, an and the are called articles. Articles are actually demonstrative adjectives and are used to point out people or things. So they are used before nouns.
to be in a hurry; to have a headache;a pity
in a loud voice; in a low voice; a shame
a bad cloud; a noise; a pleasure
We use the
But the is not used with such expressions as: last night/ week/ month/ year; next week/ month / year
What did you eat last night?
Will you come here next Sunday?
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