Mijn deken is warm, maar het matras is te hard.

In Dutch, a possessive like mijn already takes the place of an article.

So you say:

• mijn deken = my blanket
• het matras = the mattress

But you do not combine them in normal usage:

• not de mijn deken
• not mijn het deken

This works just like English: you say my blanket, not the my blanket.

Deken does have an article when it is not used with a possessive:

• de deken = the blanket

In the sentence, it becomes mijn deken, so the possessive mijn replaces the article.

Matras keeps its article because there is no possessive before it:

• het matras = the mattress

So the contrast is:

• mijn deken
• het matras

not because deken lacks an article, but because mijn is already doing that job.

This is a noun-gender/article issue. Dutch nouns take either de or het.

• de deken
• het matras

Unfortunately, this often just has to be learned with each noun. There are some patterns in Dutch, but for many everyday nouns, learners simply memorize the noun together with its article.

A good habit is to learn nouns as full units:

• de deken
• het matras

rather than just learning deken and matras by themselves.

Te means too.

So:

• hard = hard / firm
• te hard = too hard

That is different from:

• erg hard = very hard
• heel hard = very hard

So in this sentence, het matras is te hard means the mattress is more hard than desired. It is not just describing it as hard; it is saying it is excessively hard.

Because these adjectives come after the verb is and are used predicatively.

Compare:

• de deken is warm
• het matras is hard

When an adjective comes after a linking verb like zijn and describes the subject, it usually has no ending.

But before a noun, adjectives often do take -e:

• de warme deken
• het harde matras

So:

• deken is warm → no ending
• warme deken → ending
• matras is hard → no ending
• harde matras / harde matras in actual usage? Standard attributive form is het harde matras → ending

That difference is very common in Dutch.

Because this is a simple main clause joined by maar.

The sentence has two main clauses:

• Mijn deken is warm
• maar het matras is te hard

In Dutch main clauses, the finite verb is typically in the second position. Here that gives:

• Mijn deken
  • is
    • warm
• het matras
  • is
    • te hard

After maar, Dutch keeps normal main-clause word order. So there is no inversion here.

Compare that with words like dan, daarom, or morgen at the start of a clause, which often do trigger inversion. But maar does not.

Maar means but.

It connects two contrasting ideas:

• Mijn deken is warm
• maar het matras is te hard

So the speaker is saying that one thing is good or comfortable, while the other is a problem.

It is a very common coordinating conjunction, and in this use it works much like English but.

Sometimes learners wonder about this because bedding words do not always match perfectly between Dutch and English.

Deken most commonly means blanket. In some contexts, people may use other words more specifically, such as:

• dekbed = duvet / comforter
• deken = blanket

So if you specifically mean the thick bed covering that goes inside a duvet cover, dekbed is often the more precise word.

Still, deken is a normal everyday word and is perfectly understandable.

Yes, but in the context of mattresses, hard usually means firm.

So:

• een hard matras often means a firm mattress
• een zacht matras means a soft mattress

English often prefers firm for mattresses, but Dutch commonly uses hard. So this is a normal and natural choice.

In this sentence, Dutch normally repeats the verb:

• Mijn deken is warm, maar het matras is te hard.

That is the most natural full form.

In some contexts, Dutch can omit repeated material, but with a sentence like this, repeating is is standard and clear. It matches English quite closely:

• My blanket is warm, but the mattress is too hard.

So for learners, it is best to keep the full structure.

In informal writing, people sometimes leave the comma out, but the comma is standard and recommended here because it separates two main clauses joined by maar.

So the best written version is:

• Mijn deken is warm, maar het matras is te hard.

In speech, of course, you just pause slightly before maar.

Very natural. It sounds like a normal everyday complaint or observation about sleeping comfort.

A speaker might stress the contrast:

• Mijn deken is warm, maar het matras is te hard.

Often the stress would fall on warm and te hard, because those are the important descriptive parts.

You may also hear a slightly reduced pronunciation of common words in fast speech, but the sentence itself is completely standard and natural.