Ich widerrufe den Vertrag heute.

Widerrufen is a fairly formal, often legal verb. In this sentence, it means something like:

• to revoke
• to withdraw
• sometimes to cancel, depending on context

With einen Vertrag or den Vertrag, it usually refers to formally withdrawing from a contract, often under a legal right of withdrawal.

So Ich widerrufe den Vertrag heute sounds more formal and legal than everyday English I’m cancelling the contract today.

Because widerrufe is the conjugated form for ich in the present tense.

The infinitive is widerrufen.

Present tense:

• ich widerrufe
• du widerrufst
• er/sie/es widerruft
• wir widerrufen
• ihr widerruft
• sie/Sie widerrufen

So after ich, you need widerrufe.

Because den Vertrag is the direct object of the verb, so it is in the accusative case.

• nominative: der Vertrag
• accusative: den Vertrag

In this sentence, Ich is the subject, and den Vertrag is the thing being revoked.

So:

• Ich = the person doing the action
• widerrufe = the action
• den Vertrag = what is being revoked

Since Vertrag is masculine, the article changes from der to den in the accusative.

You have to learn the noun together with its article:

• der Vertrag = contract

That tells you it is masculine.

This matters because the article changes depending on case:

• nominative: der Vertrag
• accusative: den Vertrag
• dative: dem Vertrag
• genitive: des Vertrags

For German nouns, memorizing the article is essential.

Because German word order is flexible, and adverbs like heute can appear in different places.

Ich widerrufe den Vertrag heute is completely natural. Here, heute comes after the object and gives the time of the action.

Other correct versions are also possible:

• Heute widerrufe ich den Vertrag.
• Ich widerrufe heute den Vertrag.

All are grammatical, but the emphasis shifts slightly.

All three are correct, but they emphasize different things.

• Ich widerrufe den Vertrag heute.
  Fairly neutral. The speaker states the action and then adds the time.

• Heute widerrufe ich den Vertrag.
  Stronger emphasis on today. It can sound like Today is the day I’m doing it.

• Ich widerrufe heute den Vertrag.
  Also natural. Heute is placed earlier in the middle of the sentence, which can make the time feel a bit more closely connected to the verb.

German often changes word order for emphasis rather than basic meaning.

Because German main clauses normally follow the V2 rule: the finite verb comes in the second position.

In this sentence:

• position 1: Ich
• position 2: widerrufe
• then the rest: den Vertrag heute

If you move Heute to the front, the verb still stays second:

• Heute widerrufe ich den Vertrag.

That is a very important German sentence pattern.

No. Heute is an adverb, not a noun phrase, so it does not take a case here.

It simply means today and gives time information.

This is similar to English:

• today
• now
• tomorrow

You do not need an article or preposition with heute in this sentence.

Because German usually uses heute by itself, without a preposition.

So:

• heute = today
• morgen = tomorrow
• gestern = yesterday

You normally do not say:

• an heute
• auf heute

So Ich widerrufe den Vertrag heute is the normal structure.

Not exactly.

• widerrufen = to revoke / withdraw, often under a legal right of withdrawal
• kündigen = to terminate / give notice / cancel an ongoing agreement, such as a job, rental contract, or subscription

For example:

• Ich widerrufe den Vertrag.
  I revoke/withdraw from the contract.

• Ich kündige den Vertrag.
  I terminate the contract.

In some contexts both may relate to ending a contract, but they are not interchangeable in every situation. Widerrufen is more specifically legal and often tied to a formal withdrawal right.

Yes, but it sounds formal and often legal or business-like.

You might see it in:

• emails to a company
• letters
• forms
• legal communication

In casual conversation, people might use other wording depending on the situation. But in formal contexts, Ich widerrufe den Vertrag heute is perfectly natural.

Yes, it is in the present tense.

But this kind of sentence can also work as a performative statement. That means the speaker is not just describing the action — they are actually carrying it out by saying or writing it.

It is similar to English sentences like:

• I resign.
• I apologize.
• I withdraw my consent.

So Ich widerrufe den Vertrag heute can mean both:

• I am revoking the contract today
• and, in the right context, This statement itself is the revocation

It is partly irregular.

In the present tense, it mostly behaves as you would expect:

• ich widerrufe
• du widerrufst
• er widerruft

But its past forms are strong:

• simple past: widerrief
• past participle: widerrufen

So it is not fully regular.

A simple pronunciation guide is:

Ihkh vih-DER-roo-feh den fer-TRAHK HOY-teh

A few useful points:

• ich has the soft ch sound after i
• widerrufe is stressed on ru? Actually in normal pronunciation, the main stress is on ru? No — in standard German it is usually widerRUfe? Wait, for learners the safest practical guide is to listen to native audio.
  More importantly, say it as one smooth word: wi-der-ru-fe
• Vertrag is stressed on the second syllable: ver-TRAG
• heute sounds roughly like HOY-te

If you want to sound natural, the sentence rhythm is usually: Ich widerrufe den Vertrag heute.

No. In normal German, you need the article here:

• Ich widerrufe den Vertrag heute.

Without the article, it sounds ungrammatical.

German usually requires an article with countable singular nouns unless there is a special reason not to use one. Since this is a specific contract, den Vertrag is the normal form.