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in the PONS Dictionary

I. verdoppeln VB trans

verdoppeln

II. verdoppeln VB refl

sich verdoppeln
Präsens
ichverdopple / verdoppele
duverdoppelst
er/sie/esverdoppelt
wirverdoppeln
ihrverdoppelt
sieverdoppeln
Präteritum
ichverdoppelte
duverdoppeltest
er/sie/esverdoppelte
wirverdoppelten
ihrverdoppeltet
sieverdoppelten
Perfekt
ichhabeverdoppelt
duhastverdoppelt
er/sie/eshatverdoppelt
wirhabenverdoppelt
ihrhabtverdoppelt
siehabenverdoppelt
Plusquamperfekt
ichhatteverdoppelt
duhattestverdoppelt
er/sie/eshatteverdoppelt
wirhattenverdoppelt
ihrhattetverdoppelt
siehattenverdoppelt