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in the PONS Dictionary

I. kọllern [ˈkɔlɐn] VB intr

1. kollern +haben:

2. kollern +sein (kullern):

kulać [perf kulnąć] się

II. kọllern [ˈkɔlɐn] VB impers

Präsens
ichkollere
dukollerst
er/sie/eskollert
wirkollern
ihrkollert
siekollern
Präteritum
ichkollerte
dukollertest
er/sie/eskollerte
wirkollerten
ihrkollertet
siekollerten
Perfekt
ichhabegekollert
duhastgekollert
er/sie/eshatgekollert
wirhabengekollert
ihrhabtgekollert
siehabengekollert
Plusquamperfekt
ichhattegekollert
duhattestgekollert
er/sie/eshattegekollert
wirhattengekollert
ihrhattetgekollert
siehattengekollert
dev
dev
dev
dev