Stem-Changing Verbs in German

In Brief

Some common German verbs change the vowel in their stem (the core part left after removing -en) in the present-tense du and er/sie/es forms. The main beginner patterns are e → i (sprechen → du sprichst), e → ie (lesen → er liest), and a → ä (fahren → sie fährt). The other present-tense forms keep the infinitive vowel.

Overview

Stem-changing verbs are an important group of German verbs that mostly use the familiar present-tense endings but alter the vowel inside the verb. For example, the stem of sprechen is sprech-. With du and er/sie/es, it becomes sprich-: du sprichst, er spricht. This internal change is why simply attaching regular endings does not always produce the right form.

You meet these verbs from the beginning of A1 because many of them describe everyday actions: essen (to eat), lesen (to read), sehen (to see), fahren (to travel or drive), and schlafen (to sleep). English also has verbs whose vowel changes across forms, such as “sing–sang–sung,” but German makes certain changes within the present tense itself. English “I read” and “she reads” keep the same vowel; German has ich lese but sie liest.

The beginner task is manageable: learn which verbs change and remember that the change normally appears in only two present-tense slots. There is no completely reliable way to predict the change from the infinitive alone, so it is best to learn a new verb with its third-person singular form: fahren – er fährt.

How It Works

Start with the regular present-tense endings

German present-tense verbs normally take these endings. The subject is the person or thing doing the action.

Subject	Ending	Regular model: machen
ich	-e	ich mache
du	-st	du machst
er/sie/es	-t	er macht
wir	-en	wir machen
ihr	-t	ihr macht
sie/Sie	-en	sie/Sie machen

For a stem-changing verb, keep this framework. Change the stem vowel only with du and er/sie/es, then add the appropriate ending.

Subject	sprechen (e → i)	lesen (e → ie)	fahren (a → ä)
ich	ich spreche	ich lese	ich fahre
du	du sprichst	du liest	du fährst
er/sie/es	er spricht	sie liest	er fährt
wir	wir sprechen	wir lesen	wir fahren
ihr	ihr sprecht	ihr lest	ihr fahrt
sie/Sie	sie/Sie sprechen	sie/Sie lesen	sie/Sie fahren

Notice that ich, wir, ihr, and sie/Sie keep the original vowel. In particular, ihr uses the unchanged stem even though its ending is also -t: ihr sprecht, not ihr spricht.

Pattern 1: e → i

With this group, e in the stem becomes short i.

Infinitive	Meaning	du	er/sie/es
sprechen	to speak	du sprichst	er spricht
geben	to give	du gibst	sie gibt
nehmen	to take	du nimmst	er nimmt
essen	to eat	du isst	sie isst
helfen	to help	du hilfst	er hilft
treffen	to meet	du triffst	sie trifft
werfen	to throw	du wirfst	er wirft

Some forms involve more than replacing one printed letter. Nehmen becomes nimmst/nimmt, and essen becomes isst/isst. Treat these as forms to memorize rather than trying to rebuild them letter by letter.

Pattern 2: e → ie

Here, e becomes long ie in the same two forms.

Infinitive	Meaning	du	er/sie/es
lesen	to read	du liest	er liest
sehen	to see	du siehst	sie sieht
empfehlen	to recommend	du empfiehlst	er empfiehlt

In du liest, the normal -st is reduced to -t because the changed stem already ends in an s-sound. Compare du sprichst but du liest. The same practical spelling pattern appears in du isst from essen.

Pattern 3: a → ä

With many common verbs containing a, that vowel gains an umlaut in the two changing forms.

Infinitive	Meaning	du	er/sie/es
fahren	to drive; to travel	du fährst	er fährt
schlafen	to sleep	du schläfst	sie schläft
tragen	to carry; to wear	du trägst	er trägt
laufen	to run; to walk	du läufst	sie läuft
waschen	to wash	du wäschst	er wäscht
halten	to hold; to stop	du hältst	sie hält
fallen	to fall	du fällst	er fällt

The pattern includes au → äu in laufen. Do not add an umlaut to every verb with a or au: machen → du machst and kaufen → du kaufst are regular.

The change belongs to the verb, not just the spelling

Two infinitives may look similar but behave differently:

No change	Stem change
lernen → du lernst	helfen → du hilfst
fragen → du fragst	tragen → du trägst
kaufen → du kaufst	laufen → du läufst
leben → du lebst	geben → du gibst

A dictionary often lists a stem-changing verb with key forms, for example fahren (fährt, fuhr, ist gefahren). At A1, the first form in parentheses—fährt—is the most useful clue for the present tense.

Examples in Context

German	English	Note
Er spricht Deutsch.	He speaks German.	e → i with er
Sprichst du auch Englisch?	Do you also speak English?	e → i with du
Wir sprechen jeden Tag Deutsch.	We speak German every day.	No change with wir
Sie liest ein Buch.	She is reading a book.	e → ie with sie
Lest ihr gern Krimis?	Do you like reading crime novels?	No change with ihr
Ich sehe den Bus.	I see the bus.	No change with ich
Siehst du den Bahnhof?	Can you see the train station?	e → ie with du
Er fährt nach Hause.	He is going home.	a → ä with er
Fahrt ihr mit dem Zug?	Are you travelling by train?	No change with ihr
Du schläfst heute lange.	You are sleeping late today.	a → ä with du
Das Kind isst einen Apfel.	The child is eating an apple.	e → i with a singular noun subject
Was nehmt ihr zum Frühstück?	What are you having for breakfast?	No change with ihr
Meine Schwester trägt eine Brille.	My sister wears glasses.	a → ä with a singular noun subject
Der Zug hält hier nicht.	The train does not stop here.	a → ä with der Zug
Die Kinder laufen zur Schule.	The children walk to school.	No change with a plural subject

A pronoun does not have to be present for the rule to apply. Das Kind, meine Schwester, and der Zug are singular subjects and can be replaced by es, sie, and er, so their verbs use the third-person singular form.

Common Mistakes

Changing the vowel with every subject

• Wrong: Ich fahre, wir fähren.
• Right: Ich fahre, wir fahren.
• Why: The present-tense vowel change is normally limited to du and er/sie/es. The plural forms keep the infinitive vowel.

Forgetting the change with du or er/sie/es

• Wrong: Er sprecht Deutsch.
• Right: Er spricht Deutsch.
• Why: Sprechen changes e → i in the third-person singular. It also needs the ending -t, not -st.

Treating every verb with a or e as stem-changing

• Wrong: Du frägst den Lehrer.
• Right: Du fragst den Lehrer.
• Why: Standard German fragen is regular in the present tense. The spelling of the infinitive alone does not tell you that a change must occur. (The form frägst exists regionally, but it is not the standard beginner form.)

Changing the ihr form

• Wrong: Ihr liest das Buch.
• Right: Ihr lest das Buch.
• Why: Ihr takes -t but does not trigger the vowel change. Ihr lest and er liest must be learned as different forms.

Building du forms mechanically

• Wrong: Du liesst die Zeitung.
• Right: Du liest die Zeitung.
• Why: After the s-sound in the changed stem of lesen, German does not add another s from -st. The resulting form is liest.

Assuming one vowel change works in every tense

• Wrong: using fährt as a past-tense form in Gestern fährt er nach Berlin.
• Right: Gestern fuhr er nach Berlin. or Gestern ist er nach Berlin gefahren.
• Why: Fährt is present tense. Past-tense forms have their own patterns and must be learned separately.

Usage Notes

Stem-changing verbs are not rare, literary, or especially formal. They occur constantly in ordinary conversation: Was isst du?, Wann fährst du?, and Siehst du das? Learning the forms early has a large practical payoff.

German present tense can describe both a general habit and something happening now. Sie liest ein Buch may mean “She reads a book” in an appropriate context or, more naturally in many situations, “She is reading a book.” German does not need a separate continuous form like English “is reading.” This difference is about tense usage, not about the vowel change itself.

Pronunciation matters along with spelling. The ie in liest and sieht represents a long vowel, while the i in spricht and nimmt is short. The umlaut vowels in fährt and läuft are also genuine sound changes, not decorative marks. If you cannot type ä, ö, or ü, German sometimes permits ae, oe, or ue as a technical substitute, but use the umlaut in normal writing: fährt, not fahrt, because fahrt is a different form.

Beyond the Basics / Advanced Use

You do not need to master the following details at A1, but they explain forms you will meet later.

Prefixes can preserve the change

A related verb often keeps the change of its base verb. This is common with both separable and inseparable prefixes:

• fangen → er fängt; anfangen → er fängt an
• laden → sie lädt; einladen → sie lädt ein
• sprechen → er spricht; versprechen → er verspricht
• nehmen → sie nimmt; mitnehmen → sie nimmt mit

With a separable verb, the prefix moves to the end of a main clause: Der Film fängt um acht Uhr an. The stem change still occurs in the conjugated verb.

Commands do not all follow one simple rule

The informal singular imperative—the command used with du—often keeps the e → i/ie change: Sprich langsamer!, Lies den Text!, Nimm Platz! The pronoun du and the ending -st disappear.

By contrast, verbs with a → ä generally do not keep the umlaut in this command form: Fahr vorsichtig!, Schlaf gut!, Lauf schneller! These command patterns are best studied separately from the present-tense rule.

“Stem-changing” and “strong” are related labels, not identical lessons

Many of these verbs are called strong verbs, meaning that they form principal tense forms through an internal vowel change rather than only through regular endings. Their past forms may show a different vowel again: sprechen – sprach – gesprochen, fahren – fuhr – gefahren, lesen – las – gelesen.

The present-tense pattern does not let you predict every past form. It is therefore useful at higher levels to learn three principal parts together: infinitive, simple past, and past participle (the form used with haben or sein in the conversational past). The present third-person singular remains worth adding when it changes: nehmen – nimmt – nahm – genommen.

There are also irregular present-tense verbs that do not fit the three beginner patterns neatly, such as wissen → ich weiß, du weißt, er weiß. They should be learned as their own paradigms rather than forced into the rules on this page.

Practice Tips

1. Learn verbs in pairs. Instead of memorizing only lesen = to read, say and write lesen – er liest. For a noun subject, add a short sentence: Anna liest viel.
2. Practice by person, not only by verb. Make a six-line grid for sprechen, lesen, and fahren. Highlight only the du and er/sie/es rows. This makes the limited location of the change visually clear.
3. Use contrast drills aloud. Alternate forms that change and forms that do not: ich fahre – du fährst – wir fahren; ich lese – er liest – ihr lest. Speaking the contrasts helps connect spelling, sound, and subject.

Related Concepts

• Prerequisite: Regular Verbs in the Present Tense — provides the present-tense endings used around the changing stem.