Das Waschen der Kleidung macht heute keinen Spaß.

Because Waschen is being used as a noun, not as a normal verb.

In German, when an infinitive is turned into a noun, it is:

• capitalized
• usually given the article das
• treated as a neuter noun

So das Waschen means something like the washing or washing as an activity.

Nominalized infinitives in German are normally neuter, so they take das.

Examples:

• das Essen = eating / the food
• das Lesen = reading
• das Waschen = washing

So even though the original verb is waschen, once it becomes a noun, das is the standard article.

It is a noun phrase functioning as the subject of the sentence.

Breakdown:

• das Waschen = the washing
• der Kleidung = of the clothing

So the whole subject is the washing of the clothing.

Because the subject is this whole noun phrase, the verb is singular: macht.

Because Kleidung is in the genitive case here.

The noun Waschen can be followed by a genitive phrase to show what is being washed:

• das Waschen der Kleidung = the washing of the clothing

Important points:

• die Kleidung is the base form
• Kleidung is feminine singular
• the genitive singular of feminine nouns uses der

So:

• nominative: die Kleidung
• genitive: der Kleidung

It is singular.

Kleidung is a collective noun, similar to clothing in English. Even though English often uses clothes, German often uses singular Kleidung.

So:

• die Kleidung = clothing
• not a plural form here

If you wanted actual plural items of clothing, you might use a different word depending on context.

Because the subject is singular.

The subject is not Kleidung by itself. The subject is the whole phrase:

• Das Waschen der Kleidung

The head of that phrase is Waschen, and it is singular as a noun, so the verb must also be singular:

• Das Waschen ... macht

Because Spaß is in the accusative case here.

The expression is:

• Spaß machen = to be fun / to give enjoyment

In this sentence, Spaß is the direct object of macht, so it must be in the accusative.

Since:

• Spaß is masculine
• accusative masculine with kein becomes keinen

So:

• nominative: kein Spaß
• accusative: keinen Spaß

That is why the sentence has macht heute keinen Spaß.

Yes. It is a very common German expression.

Literally, Spaß machen looks like to make fun, but in normal usage it means:

• to be fun
• to be enjoyable

Examples:

• Das macht Spaß. = That is fun.
• Das macht keinen Spaß. = That is not fun.

So in your sentence, macht heute keinen Spaß means the activity is not enjoyable today.

Yes, heute can move, but the emphasis changes slightly.

In the original sentence:

• Das Waschen der Kleidung macht heute keinen Spaß.

This is a neutral placement. heute sits in the middle of the sentence, which is very common.

You could also say:

• Heute macht das Waschen der Kleidung keinen Spaß.

That puts more emphasis on today.

Both are grammatical. German allows some flexibility with adverb placement, but the finite verb in a main clause still has to stay in second position.

Because German main clauses follow the verb-second rule.

In a normal statement, the finite verb comes second:

• Das Waschen der Kleidung = position 1
• macht = position 2

Even if another element comes first, the verb still stays second:

• Heute = position 1
• macht = position 2
• das Waschen der Kleidung = later in the sentence

So German is not simply subject-verb-object all the time; the key rule is that the finite verb is in second position in main clauses.

Yes.

These are related, but they are built differently:

• das Waschen der Kleidung = a noun phrase, more like the washing of the clothing
• die Kleidung waschen = a verb phrase, more like to wash the clothing or washing the clothing

For example:

• Das Waschen der Kleidung macht heute keinen Spaß.
• Die Kleidung zu waschen macht heute keinen Spaß.

Both are possible, but the first one sounds more nominal and structured, while the second feels more directly verbal.

It is grammatical and understandable, but in everyday speech many speakers might choose a more natural-sounding version such as:

• Wäsche waschen macht heute keinen Spaß.
• Heute macht Wäschewaschen keinen Spaß.

Why? Because Wäsche waschen is a very common everyday expression for doing laundry.

So your sentence is fine, but depending on context, a native speaker might use a slightly different wording that sounds more idiomatic in daily life.