Specific or general
Do we mean one particular thing, any one, or the whole kind?
משמעות
We can talk about one particular thing, any member of a group, or a whole kind of thing. This shows whether choosing a particular member matters. Languages express these meanings with articles, pointing words, other words, or context; some have no articles. Unlike New and known information, this is not about whether the listener already knows what is being talked about.
איך לזהות
Ask whether the speaker has a particular person or thing in mind, would accept any member of the group, or is talking about the kind as a whole.
בשפה הנלמדת
English uses articles such as a/an and the, along with words such as this and any, to show which thing is meant. A/an can present one member of a group without itself identifying which one, even when the speaker has a particular one in mind. To talk about a whole kind, English commonly uses a plural noun without an article, though other patterns are possible.
I'm looking for a book I left here.
The speaker has a particular book in mind, even though the noun uses a.
You can use any chair.
No particular chair is required.
Cats need a lot of sleep.
Cats without an article refers to the kind in general.
Learners whose language has no articles may leave out a/an or the where English needs one. Learners whose language uses a definite article for whole kinds may add the when a bare plural noun is more natural.