German Auxiliary Verbs – Complete Guide to haben, sein, and werden

Key takeaways

• German has three auxiliary verbs: haben (to have), sein (to be), and werden (to become/will/be) — each with multiple grammatical functions.
• Haben forms the Perfekt with most verbs; sein is used with verbs of motion, change of state, and a small fixed group of exceptions.
• Werden has three distinct uses: Futur I (future tense), Vorgangspassiv (passive voice), and the standalone meaning "to become."
• All three auxiliaries are irregular verbs — their conjugation must be memorized, but the patterns are compact and high-frequency.
• Getting haben vs sein right in the Perfekt is one of the most important skills in German — a learnable system, not a guessing game.

German auxiliary verbs are the engine behind most compound verb structures. Without them, you cannot form the Perfekt (the main past tense in spoken German), the future tense, or the passive voice. These three verbs — haben, sein, werden — appear in virtually every paragraph of German text and every conversation. More importantly, each one carries multiple functions that learners need to keep distinct.

This guide covers all three auxiliary verbs in depth: full conjugation tables, the complete haben vs sein rule for Perfekt, every use of werden, the two types of passive in German, and extensive real sentence examples. If you want guided practice alongside this reference, explore German on Promova and build fluency step by step.

What are German auxiliary verbs?

An auxiliary verb (Hilfsverb) is a verb that combines with a main verb to build compound verb structures. The auxiliary carries the grammatical information (tense, mood, voice), while the main verb carries the lexical meaning. In English, "have" and "be" serve similar functions: "I have eaten," "It is being built."

German has three core auxiliaries, each indispensable:

• haben — used to form Perfekt, Plusquamperfekt, and Futur II with most verbs
• sein — used to form Perfekt, Plusquamperfekt, and Futur II with verbs of motion and change of state
• werden — used for Futur I, Futur II, and all passive constructions; also stands alone meaning "to become"

haben — conjugation and all uses

Conjugation of haben (present tense)

• ich habe — I have
• du hast — you have
• er/sie/es hat — he/she/it has
• wir haben — we have
• ihr habt — you all have
• sie/Sie haben — they/you (formal) have

Simple past (Präteritum): ich hatte, du hattest, er hatte, wir hatten, ihr hattet, sie hatten

haben as a Perfekt auxiliary

Haben is the default auxiliary for Perfekt. It pairs with most German verbs — transitive verbs (those with a direct object), reflexive verbs, and most intransitive verbs that do not involve motion or change of state:

• Ich habe das Buch gelesen. — I have read the book. (transitive)
• Sie hat gearbeitet. — She has worked. (intransitive, no motion)
• Wir haben gegessen. — We have eaten.
• Er hat sich gewaschen. — He has washed himself. (reflexive)
• Hast du das verstanden? — Did you understand that?

haben as a standalone verb

Haben also functions independently as a full lexical verb meaning "to have" or "to possess":

• Ich habe einen Hund. — I have a dog.
• Er hat keine Zeit. — He has no time.
• Hast du Hunger? — Are you hungry?

sein — conjugation and all uses

Conjugation of sein (present tense)

• ich bin — I am
• du bist — you are
• er/sie/es ist — he/she/it is
• wir sind — we are
• ihr seid — you all are
• sie/Sie sind — they/you (formal) are

Simple past (Präteritum): ich war, du warst, er war, wir waren, ihr wart, sie waren

sein as a Perfekt auxiliary — the rules

Sein is used in the Perfekt instead of haben with two main categories of verbs:

1. Verbs of motion from point A to point B (change of location):

• Ich bin nach Berlin gefahren. — I drove to Berlin.
• Sie ist gelaufen. — She ran / has run.
• Wir sind geflogen. — We flew.
• Er ist geschwommen. — He swam. (directed motion)

2. Verbs of change of state (something changes fundamentally):

• Er ist aufgewacht. — He woke up.
• Das Kind ist eingeschlafen. — The child fell asleep.
• Die Blume ist verwelkt. — The flower wilted.
• Er ist gestorben. — He died.
• Sie ist geworden. — She became. (using werden as lexical verb)

3. A small group of fixed exceptions that use sein:

• sein itself: Ich bin gewesen. — I was / have been.
• bleiben: Er ist geblieben. — He stayed.
• passieren/geschehen: Was ist passiert? — What happened?
• gelingen/misslingen: Es ist gelungen. — It succeeded.

Key distinction to remember: undirected motion (going in circles, swimming for exercise) takes haben: Er hat geschwommen (he swam for exercise). Directed motion toward a destination takes sein: Er ist durch den See geschwommen (he swam across the lake).

sein as a standalone verb and in Zustandspassiv

Sein also functions as a full linking verb meaning "to be," connecting a subject to a description or identity:

• Er ist Arzt. — He is a doctor.
• Das Wetter ist schön. — The weather is beautiful.
• Ich bin müde. — I am tired.

In the Zustandspassiv (stative passive), sein + past participle describes a state resulting from a past action — contrasting with the Vorgangspassiv (process passive) formed with werden:

• Die Tür ist geöffnet. — The door is open. (state — Zustandspassiv with sein)
• Die Tür wird geöffnet. — The door is being opened. (ongoing action — Vorgangspassiv with werden)

werden — conjugation and all uses

Conjugation of werden (present tense)

• ich werde — I become / will
• du wirst — you become / will
• er/sie/es wird — he/she/it becomes / will
• wir werden — we become / will
• ihr werdet — you all become / will
• sie/Sie werden — they/you (formal) become / will

Simple past (Präteritum): ich wurde, du wurdest, er wurde, wir wurden, ihr wurdet, sie wurden

Use 1: werden as a standalone verb — "to become"

Werden on its own means "to become" or "to get" — expressing a transition or change:

• Er wird Arzt. — He is becoming a doctor.
• Es wird dunkel. — It is getting dark.
• Das Kind wird größer. — The child is getting bigger.
• Sie wurde krank. — She became ill.

Use 2: werden + infinitive — Futur I (future tense)

Werden + infinitive at the end forms the future tense (or expresses present probability):

• Ich werde morgen kommen. — I will come tomorrow.
• Es wird regnen. — It will rain.
• Er wird schlafen. — He is probably sleeping. (probability)
• Wirst du das schaffen? — Will you manage it?

Use 3: werden + past participle — Vorgangspassiv (process passive)

Werden + past participle forms the standard passive voice in German, describing an ongoing or completed process:

• Das Haus wird gebaut. — The house is being built. (present passive)
• Der Brief wird geschrieben. — The letter is being written.
• Das Auto wurde repariert. — The car was repaired. (past passive)
• Der Kuchen wird gegessen werden. — The cake will be eaten. (future passive)

The agent (by whom) is introduced with von + dative:

• Das Buch wurde von der Autorin geschrieben. — The book was written by the author.

haben vs sein in Perfekt — the decision rule

The haben vs sein choice is one of the most important — and most practiced — decisions in German grammar. Here is the complete decision logic:

• Does the verb have a direct object (accusative)? → haben (all transitive verbs use haben): Ich habe das Buch gelesen.
• Is it a reflexive verb? → haben: Sie hat sich gefreut.
• Does the verb show directed motion from A to B? → sein: Er ist nach Hause gegangen.
• Does the verb show a change of state? → sein: Das Kind ist eingeschlafen.
• Is it one of the fixed exceptions (sein, bleiben, passieren, gelingen)? → sein
• Everything else (intransitive, no motion, no state change)? → haben: Ich habe gearbeitet.

Common pairs that confuse learners:

• hängen (to hang, intransitive) → hat gehangen; hängen (to hang up, transitive) → hat gehängt
• liegen (to lie) → hat gelegen; legen (to lay) → hat gelegt
• schwimmen (undirected) → hat geschwommen; (directed) → ist geschwommen

Modal verbs — semi-auxiliaries

German also has six modal verbs that behave similarly to auxiliaries — they combine with an infinitive and modify the meaning of the main verb:

• können — can, to be able to: Ich kann Deutsch sprechen.
• müssen — must, have to: Er muss arbeiten.
• dürfen — may, to be allowed to: Hier darf man nicht rauchen.
• sollen — should, to be supposed to: Du sollst das nicht tun.
• wollen — want to, to intend to: Sie will reisen.
• mögen/möchten — to like / would like: Ich möchte einen Kaffee.

In compound tenses, modals form a special construction called the Ersatzinfinitiv (substitute infinitive) where the past participle is replaced by an infinitive: Ich habe arbeiten müssen (I had to work — not *gemusst*).

Word order with auxiliary verbs

In main clauses, the auxiliary occupies second position and the non-finite verb form (infinitive or past participle) moves to the end:

• Ich habe das Buch gelesen. (Perfekt — participle at end)
• Wir werden morgen ankommen. (Futur I — infinitive at end)
• Das Haus wird gebaut. (Passive — participle at end)

In subordinate clauses, the auxiliary moves to the end and comes after the past participle or infinitive:

• Ich weiß, dass er das Buch gelesen hat. — I know that he has read the book. (hat after participle)
• Ich glaube, dass es regnen wird. — I think it will rain. (wird after infinitive)

Tips for mastering German auxiliary verbs

• Memorize all three conjugations completely. Haben, sein, werden are irregular and appear in every tense, voice, and mood in German. Investing time in their conjugation tables pays dividends across every other grammar topic.
• Learn the haben vs sein rule as a decision tree, not a list. The question sequence — transitive? reflexive? directed motion? change of state? fixed exception? — resolves every Perfekt auxiliary choice systematically. Drill it with the decision questions until it becomes automatic.
• Track werden's three functions separately. When you encounter wird, ask: is an infinitive following (Futur I)? Is a past participle following (passive)? Is neither following ("to become")? This three-way check prevents the most common confusion.
• Build sentences in all three tenses with the same verb. Take one verb and produce: Ich lese (present) → Ich habe gelesen (Perfekt) → Ich werde lesen (Futur I) → Es wird gelesen (passive). This parallel practice locks in the structure of each construction.
• Read and underline auxiliaries in real texts. Every newspaper article, story, or email contains multiple auxiliary constructions. Identifying them actively — and noting which tense or voice they form — accelerates pattern recognition faster than isolated drills.

Learn German auxiliary verbs with support from Promova

Promova offers structured lessons on all three German auxiliary verbs — from basic conjugation to Perfekt formation, passive voice, and future tense structures. Interactive exercises give you immediate feedback on haben vs sein choices and werden constructions, and speaking practice helps you internalize the word order patterns until they become automatic.

Final thoughts on German auxiliary verbs

German auxiliary verbs are three compact but extraordinarily productive verbs. Haben forms the Perfekt with the majority of German verbs; sein handles motion and change; werden drives the future tense and both types of passive. Master the conjugation tables, internalize the haben vs sein decision logic, and understand werden's three distinct roles — and you will have unlocked the structural core of German verb grammar.