Use "the" to talk about specific things in a group.

Use "a" for singular countable nouns mentioned for the first time.

Use "the" to specify a particular group of people or things.

No article with uncountable nouns used in a general sense.

Use "a" for expressions of frequency (e.g., once a year, twice a week).

Use "an" before singular countable nouns starting with a vowel sound when we mean “one”.

Use "a" when referring to one item from a group of similar items.

We are talking about all tigers, but later "the" is used to refer to a specific tiger.

Use "a" for singular countable nouns when mentioning them for the first time and we don’t mean a specific one.

Use "the" with names of mountain ranges.

Use "the" when both the speaker and listener know what is being referred to. Also homework is an uncountable noun, so „a“ is impossible to use.

Use "the" when talking about a specific building, not its purpose.

No article with institutions when referring to their primary purpose (not the buildings).

Use "the" with places that are unique in a given context (e.g., cinema).

No article for general meals (e.g., breakfast, lunch, dinner).

Use "a/an" when talking about professions.

Use "the" with names of countries that include words like "States" or "Republic."

Use "an" before singular countable nouns starting with a vowel sound.

Use "the" for specific meals when referring to a particular meal of the day (but we don’t use “a”).

Use "the" to refer to a specific movie already mentioned or known.

Use "a" in exclamations starting with "What" followed by a singular noun.

Use "an" before singular countable nouns starting with a vowel sound. We usually use “a/an” with jobs.

Use "the" to talk about something mentioned earlier or known specifically.

Use "the" with musical instruments.

Use "a" when mentioning something for the first time. „U“ in UFO is pronounced as [ju:] that’s why we use „a“ and not „an“.