Here, the noun "car" is indefinite, and it refers to any car in general, not a specific one. It's 'a' not 'an' because it comes before a consonant 'n'.

When referring to a specific landmark or monument like the Eiffel Tower, we use the definite article "the."

When referring to a specific noun (such as the theatre they are planning to visit tonight), we use the definite article "the."

In this context, "movie" is a general reference to any movie, not a specific one. It's 'an' because it comes before the vowel 'i'.

"The" comes before a noun that has been previously mentioned or introduced in the conversation.

Generalised plural nouns not referring to anything specific don't take an article.

Articles are determiners. If another determiner has already been used ('that' in this case) we don't need an article.

Use the article "a" or "an" to indicate any non-specified member of a group or category. This is the same as question 1.

Use "the" when the noun refers to something or someone that is unique - there's only one weather.

Use the indefinite article to indicate one in number (as opposed to more than one).

We don't generally use an article with plural countable nouns or any non-countable nouns that are used to refer to all things in general.

"The" is placed before ordinal numbers (e.g., first, second) to specify the position or order of something in a sequence.

We don't generally use an article with plural countable nouns or any non-countable nouns that are used to refer to abstract things (e.g. music, happiness, education).

In geography, "the" is used with large regions, deserts, peninsulas, oceans, seas, gulfs, canals, rivers, mountain ranges, and groups of islands.

Avoid using "the" with streets, parks, cities, states, counties, most countries (i.e. those not united such as the United States), continents, bays, individual lakes, solitary mountains, or islands.