At CEFR level A1, learners discover that many everyday German verbs change their stem vowel in the du and er/sie/es present tense forms—a pattern that is essential for speaking and writing correctly about common actions like eating, reading, and driving.
Kernregel: Stem-changing verbs only change their vowel in the du and er/sie/es forms—for example, fahren becomes du fährst / er fährt, while all other forms keep the original stem vowel.
At CEFR level A1, learners discover that many everyday German verbs change their stem vowel in the du and er/sie/es present tense forms – a pattern that is essential for speaking and writing correctly about common actions like eating, reading, and driving.
Kernregel: Stem-changing verbs only change their vowel in the du and er/sie/es forms – for example, fahren becomes du fährst / er fährt, while all other forms keep the original stem vowel.
Was ist ein Vokalwechsel? – What Is a Vowel Change?
Some German verbs undergo a vowel change in their stem when conjugated in the present tense. This change happens only in the 2nd person singular (du) and 3rd person singular (er/sie/es) forms. All other forms (ich, wir, ihr, sie, Sie) keep the original stem vowel from the infinitive.
Merke: The vowel change affects only “du” and “er/sie/es” forms. The personal endings remain the same as with regular verbs (-e, -st, -t, -en, -t, -en).
Warum ist es wichtig? – Why Does It Matter?
Stem-changing verbs are extremely common in everyday German conversation. Many of the most frequently used verbs – such as speaking, eating, sleeping, and reading – undergo these vowel changes. Mastering this pattern is essential for natural communication at the A1 level.
Die drei Hauptgruppen – The Three Main Patterns
There are three main patterns of vowel changes in German present tense verbs:
e → i(e)
sprechen → du sprichst, er spricht
essen → du isst, er isst
geben → du gibst, er gibt
The stem vowel “e” changes to “i” or “ie” in the du and er/sie/es forms.
a → ä
fahren → du fährst, er fährt
tragen → du trägst, er trägt
schlafen → du schläfst, er schläft
The stem vowel “a” takes an Umlaut (ä) in the du and er/sie/es forms.
au → äu
laufen → du läufst, er läuft
The diphthong “au” changes to “äu” in the du and er/sie/es forms. This pattern is less common.
Konjugationsbeispiele – Conjugation Examples
Let’s examine complete conjugations for representative verbs from each group:
Gruppe 1: e → i (sprechen – to speak)
| Singular |
Plural |
| ich |
spreche |
wir |
sprechen |
| du |
sprichst |
ihr |
sprecht |
| er/sie/es |
spricht |
sie/Sie |
sprechen |
Gruppe 1: e → ie (lesen – to read)
| Singular |
Plural |
| ich |
lese |
wir |
lesen |
| du |
liest |
ihr |
lest |
| er/sie/es |
liest |
sie/Sie |
lesen |
Gruppe 2: a → ä (fahren – to drive)
| Singular |
Plural |
| ich |
fahre |
wir |
fahren |
| du |
fährst |
ihr |
fahrt |
| er/sie/es |
fährt |
sie/Sie |
fahren |
Gruppe 3: au → äu (laufen – to run)
| Singular |
Plural |
| ich |
laufe |
wir |
laufen |
| du |
läufst |
ihr |
lauft |
| er/sie/es |
läuft |
sie/Sie |
laufen |
Besonderheit: wissen (to know) – Special Case
The verb wissen is irregular and follows its own unique pattern. It has vowel changes and also drops the ending in the singular forms, making it quite distinct from other stem-changing verbs.
| Singular |
Plural |
| ich |
weiß |
wir |
wissen |
| du |
weißt |
ihr |
wisst |
| er/sie/es |
weiß |
sie/Sie |
wissen |
Merke: “Wissen” is the only verb with this pattern. In the singular, it looks similar to the past tense of other verbs, but it’s actually a present tense form!
Häufige Verben mit Vokalwechsel – Common Stem-Changing Verbs
Here’s a list of common stem-changing verbs organised by pattern:
e → i
- sprechen – to speak (du sprichst, er spricht)
- essen – to eat (du isst, er isst)
- geben – to give (du gibst, er gibt)
- nehmen – to take (du nimmst, er nimmt)
- treffen – to meet (du triffst, er trifft)
- helfen – to help (du hilfst, er hilft)
- vergessen – to forget (du vergisst, er vergisst)
e → ie
- lesen – to read (du liest, er liest)
- sehen – to see (du siehst, er sieht)
- empfehlen – to recommend (du empfiehlst, er empfiehlt)
- stehlen – to steal (du stiehlst, er stiehlt)
a → ä
- fahren – to drive (du fährst, er fährt)
- schlafen – to sleep (du schläfst, er schläft)
- tragen – to carry/wear (du trägst, er trägt)
- waschen – to wash (du wäschst, er wäscht)
- fallen – to fall (du fällst, er fällt)
- halten – to hold/stop (du hältst, er hält)
au → äu
- laufen – to run (du läufst, er läuft)
Satzbau: Verbposition – Sentence Structure
Just like regular verbs, stem-changing verbs follow the same word order rules in German sentences. The conjugated verb position remains constant regardless of whether the verb has a vowel change or not.
Aussagesatz (Statement)
The conjugated verb stays in the second position.
- Maria liest jeden Tag die Zeitung.
- Max schläft immer bis 10 Uhr.
- Du sprichst sehr gut Deutsch!
Fragesatz mit Fragewort (Wh-question)
Question word first, then the verb in second position.
- Was isst du gern?
- Wohin fährst du morgen?
- Wann trifft sie ihren Chef?
Fragesatz ohne Fragewort (Yes/No question)
The verb moves to the first position.
- Liest du gern Romane?
- Fährt er mit dem Auto?
- Hilft sie dir bei den Hausaufgaben?
Lerntipps – Learning Tips
How to remember stem-changing verbs:
- Focus on learning the du and er/sie/es forms specifically, as these are the only ones that change.
- Many stem-changing verbs relate to basic daily activities (eating, sleeping, reading, driving) – practise these frequently in context.
- When you learn a new verb, check if it’s stem-changing and memorise the pattern immediately.
- Group verbs by their vowel change pattern to make memorisation easier.
- The vowel change never affects “ich,” “wir,” “ihr,” “sie,” or “Sie” – these forms always keep the original stem vowel.
Zusammenfassung – Quick Reference
- Stem-changing verbs undergo vowel changes only in du and er/sie/es forms.
- Three main patterns: e→i(e), a→ä, and au→äu.
- The personal endings remain the same as regular verbs (-e, -st, -t, -en, -t, -en).
- “Wissen” is a special irregular verb with unique forms in the singular.
- Word order rules remain the same as with regular verbs.
- Many common everyday verbs are stem-changing verbs, making them essential for communication.
Häufig gestellte Fragen – FAQ
Which German verbs have a vowel change in the present tense?
Many common German verbs undergo a vowel change in the du and er/sie/es forms in the present tense. The three main patterns are: e→i (sprechen→er spricht, essen→er isst, geben→er gibt), e→ie (lesen→er liest, sehen→er sieht), and a→ä (fahren→er fährt, schlafen→er schläft, tragen→er trägt). The pattern au→äu is rare: laufen→er läuft.
Does the vowel change affect all conjugation forms of German stem-changing verbs?
No. The vowel change only affects the du (2nd person singular) and er/sie/es (3rd person singular) forms. All other forms—ich, wir, ihr, sie, Sie—keep the original stem vowel from the infinitive. For example, fahren: ich fahre, du fährst, er fährt, wir fahren, ihr fahrt, sie fahren.
How do I conjugate wissen in German present tense?
Wissen (to know) is irregular and has a special pattern: ich weiß, du weißt, er/sie/es weiß, wir wissen, ihr wisst, sie/Sie wissen. Notice that the singular forms (ich, er/sie/es) use weiß, which looks different from the infinitive. This is the only German verb with this specific pattern.