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in the PONS Dictionary

eifern [ˈaɪfɐn] VB intr

1. eifern form (streben):

eifern nach
stremiti imperf ka

2. eifern (schmähen):

eifern gegen
izgrditi || grditi
Präsens
icheifere
dueiferst
er/sie/eseifert
wireifern
ihreifert
sieeifern
Präteritum
icheiferte
dueifertest
er/sie/eseiferte
wireiferten
ihreifertet
sieeiferten
Perfekt
ichhabegeeifert
duhastgeeifert
er/sie/eshatgeeifert
wirhabengeeifert
ihrhabtgeeifert
siehabengeeifert
Plusquamperfekt
ichhattegeeifert
duhattestgeeifert
er/sie/eshattegeeifert
wirhattengeeifert
ihrhattetgeeifert
siehattengeeifert
See further verb tables