The German verb "zweifeln" means "to doubt" in English. It is a regular verb. Below you'll find the complete conjugation tables for "zweifeln" across all 7 tenses. New to German verbs? Start with the German verb guide.
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How to Conjugate "zweifeln" in the Present Tense
Präsens Actions happening now or regularly| Person | English | Conjugation |
|---|---|---|
| ich | I | zweifle |
| du | you (informal) | zweifelst |
| er/sie/es | he/she/it | zweifelt |
| wir | we | zweifeln |
| ihr | you all (informal) | zweifelt |
| sie/Sie | they/you (formal) | zweifeln |
Er zweifelt an dem Plan.
He doubts the plan.
How to Conjugate "zweifeln" in the Simple Past Tense
Präteritum Completed actions in the past (written/formal)| Person | English | Conjugation |
|---|---|---|
| ich | I | zweifelte |
| du | you (informal) | zweifeltest |
| er/sie/es | he/she/it | zweifelte |
| wir | we | zweifelten |
| ihr | you all (informal) | zweifeltet |
| sie/Sie | they/you (formal) | zweifelten |
Er zweifelte an der Lösung gestern.
He doubted the solution yesterday.
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Perfekt Completed actions (spoken German)| Person | English | Conjugation |
|---|---|---|
| ich | I | habe gezweifelt |
| du | you (informal) | hast gezweifelt |
| er/sie/es | he/she/it | hat gezweifelt |
| wir | we | haben gezweifelt |
| ihr | you all (informal) | habt gezweifelt |
| sie/Sie | they/you (formal) | haben gezweifelt |
Er hat an dem Plan gezweifelt.
He has doubted the plan.
How to Conjugate "zweifeln" in the Past Perfect Tense
Plusquamperfekt Actions completed before another past action| Person | English | Conjugation |
|---|---|---|
| ich | I | hatte gezweifelt |
| du | you (informal) | hattest gezweifelt |
| er/sie/es | he/she/it | hatte gezweifelt |
| wir | we | hatten gezweifelt |
| ihr | you all (informal) | hattet gezweifelt |
| sie/Sie | they/you (formal) | hatten gezweifelt |
Er hatte an dem Erfolg gezweifelt.
He had doubted the success.
How to Conjugate "zweifeln" in the Future Tense
Futur I Actions that will happen| Person | English | Conjugation |
|---|---|---|
| ich | I | werde zweifeln |
| du | you (informal) | wirst zweifeln |
| er/sie/es | he/she/it | wird zweifeln |
| wir | we | werden zweifeln |
| ihr | you all (informal) | werdet zweifeln |
| sie/Sie | they/you (formal) | werden zweifeln |
Er wird am Erfolg zweifeln.
He will doubt the success.
How to Conjugate "zweifeln" in the Subjunctive I Tense
Konjunktiv I Indirect speech and formal requests| Person | English | Conjugation |
|---|---|---|
| ich | I | zweifle |
| du | you (informal) | zweifelst |
| er/sie/es | he/she/it | zweifle |
| wir | we | zweifeln |
| ihr | you all (informal) | zweifelt |
| sie/Sie | they/you (formal) | zweifeln |
Er zweifle an der Idee.
He may doubt the idea.
How to Conjugate "zweifeln" in the Subjunctive II Tense
Konjunktiv II Hypothetical situations and polite requests| Person | English | Conjugation |
|---|---|---|
| ich | I | zweifelte |
| du | you (informal) | zweifeltest |
| er/sie/es | he/she/it | zweifelte |
| wir | we | zweifelten |
| ihr | you all (informal) | zweifeltet |
| sie/Sie | they/you (formal) | zweifelten |
Er zweifelte gern an ihr.
He would like to doubt her.
Frequently Asked Questions About "zweifeln"
Is "zweifeln" regular or irregular in German?
"Zweifeln" is a regular German verb that follows standard conjugation patterns for its verb group.
What does "zweifeln" mean in English?
The German verb "zweifeln" means "to doubt" in English.
How do you conjugate "zweifeln" in the present tense?
In the present tense (Präsens): ich → zweifle, du → zweifelst, er/sie/es → zweifelt, wir → zweifeln, ihr → zweifelt, sie/Sie → zweifeln.
How many tenses does "zweifeln" have in German?
"Zweifeln" is conjugated across 7 tenses in German: Present, Simple Past, Present Perfect, Past Perfect, Future, Subjunctive I, Subjunctive II.
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