Maden derin.

Breakdown of Maden derin.

olmak
to be
derin
deep
maden
the mine
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Questions & Answers about Maden derin.

Why is there no copula (like is) in Maden derin?
In Turkish, the present‐tense copula (“to be”) is usually omitted. Instead of saying Maden derin oluyor or similar, you simply juxtapose subject and predicate adjective. The sentence Maden derin literally reads “Mine deep,” but functionally means “The mine is deep.”
Why don’t we see an article such as the or a in Maden derin?
Turkish has no definite or indefinite articles. Maden derin can mean “(The) mine is deep” or “A mine is deep,” depending on context. If you really need an indefinite sense, you can add bir (“a”): Bir maden derin (“A mine is deep”).
Why doesn’t maden take any case ending or suffix here?
In simple nominal (equational) clauses, the subject (here maden) stays in the unmarked (nominative) form. There’s no need for a subject marker or case ending when it’s clear from word order and context.
Adjectives normally precede nouns in Turkish, so why is derin placed after maden?
When an adjective modifies a noun attributively—like “a deep mine”—it goes before: derin maden or derin bir maden. But in predicative position (after a linking/copula verb, which is omitted in present tense), the adjective follows the subject. So Maden derin is a full clause (subject + predicate), not a noun phrase.
How would you make a negative sentence, “The mine is not deep”?

Insert the negator değil after the adjective:
Maden derin değil.

How do you ask “Is the mine deep?” in Turkish?

Add the question particle mi after the adjective (no vowel harmony):
Maden derin mi?

Can I add the suffix -dir to derin? When and why?

Yes. -dir is a formal copular suffix expressing general truths or academic style.
Maden derindir.
In spoken Turkish, though, you typically drop -dir and say simply Maden derin.

How would you express “The mine was deep” (past tense)?

Attach the past‐tense suffix -di to the copular adjective:
Maden derindi.
You can also say Maden derin idi (a bit more explicit).

If I want to emphasize “deep,” can I say Maden çok derin?

Absolutely. Çok (“very”) precedes the adjective:
Maden çok derin.
You can even add adverbs of degree like bayağı (“quite”) in the same slot.