Die Fußmatte ist noch nass vom Regen.

Because Fußmatte is a feminine noun in German, so it takes the article die in the nominative singular.

• die Fußmatte = the doormat
• grammatical gender must be memorized with the noun

Here, die Fußmatte is also the subject of the sentence.

It is in the nominative case, because it is the subject of the sentence — the thing that is still wet.

You can think of the structure as:

• Die Fußmatte = subject
• ist = verb
• noch nass = description
• vom Regen = cause/source

German often forms nouns by combining smaller words into a compound noun.

• Fuß = foot
• Matte = mat
• Fußmatte = doormat

This is very normal in German. Unlike English, German usually writes these combinations as one word.

Here, noch means still.

So ist noch nass means is still wet.

It suggests that the doormat was wet before and has not dried yet.
That little word adds an idea of continuing state.

Because nass is used predicatively here — that means it comes after the verb sein and describes the subject.

In German:

• before a noun, adjectives usually get endings:
  die nasse Fußmatte
• after sein, they usually do not get endings:
  Die Fußmatte ist nass

So in this sentence, nass stays plain.

Vom is a contraction of von dem.

• von dem Regen → vom Regen

This contraction is very common and usually sounds more natural than the full form.

Because the preposition von always takes the dative case.

The noun Regen is masculine:

• nominative: der Regen
• dative: dem Regen

So:

• von dem Regen
• contracted: vom Regen

Literally, it means from the rain.

In this sentence, it expresses the cause of the wetness:

• nass vom Regen = wet from the rain / wet because of the rain

So von is not only about physical origin; it can also show what caused a condition.

No, this is a very standard German main clause.

The order is:

1. Die Fußmatte — subject
2. ist — conjugated verb in second position
3. noch nass — predicate/adjective phrase
4. vom Regen — prepositional phrase

German main clauses usually put the finite verb in second position, and this sentence follows that rule perfectly.

Yes. That would also be correct.

The difference is:

• Die Fußmatte ist nass vom Regen.
  The doormat is wet from the rain.
• Die Fußmatte ist noch nass vom Regen.
  The doormat is still wet from the rain.

So noch adds the idea that the wetness is continuing.

The letter ß is called Eszett or scharfes S. It is pronounced like ss.

So Fuß sounds roughly like fooss with a long vowel.

Important point:

• ß is not pronounced like English z
• it usually indicates that the vowel before it is long

So:

• Fuß = long u sound
• Fuss would be a different spelling

Yes, but the wording may change slightly in tone or style.

For example:

• Die Fußmatte ist noch nass vom Regen.
  very natural, everyday German
• Die Fußmatte ist wegen des Regens noch nass.
  also correct, slightly more explicit: because of the rain

Both work, but nass vom Regen sounds very natural for describing something made wet by rain.

Because all nouns are capitalized in German.

So in this sentence:

• Fußmatte is a noun
• Regen is a noun

That is why both begin with capital letters. This is one of the most noticeable spelling rules in German.