📒 used before countable or singular nouns referring to people or things that have not already been mentioned
📒 used to show that somebody/something is a member of a group or profession
📒 any; every
📒 used before uncountable nouns when these have an adjective in front of them, or phrase following them
📒 used in front of two nouns that are seen as a single unit
📒 used instead of one before some numbers
📒 used when talking about prices, quantities and rates
📒 a person like somebody
📒 used before somebody’s name to show that the speaker does not know the person
📒 used before the names of days of the week to talk about one particular day