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in the PONS Dictionary

an|zweifeln VB trans

anzweifeln
posumnjati || sumnjati u +acc
anzweifeln
dovesti || dovoditi u sumnju +acc
Präsens
ichzweifle / zweifelean
duzweifelstan
er/sie/eszweifeltan
wirzweifelnan
ihrzweifeltan
siezweifelnan
Präteritum
ichzweifeltean
duzweifeltestan
er/sie/eszweifeltean
wirzweifeltenan
ihrzweifeltetan
siezweifeltenan
Perfekt
ichhabeangezweifelt
duhastangezweifelt
er/sie/eshatangezweifelt
wirhabenangezweifelt
ihrhabtangezweifelt
siehabenangezweifelt
Plusquamperfekt
ichhatteangezweifelt
duhattestangezweifelt
er/sie/eshatteangezweifelt
wirhattenangezweifelt
ihrhattetangezweifelt
siehattenangezweifelt
See further verb tables
dev
dev
dev
dev