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in the PONS Dictionary

zerfallen irr VB intr +sein

1. zerfallen (Bau):

zerfallen
yıkılmak

2. zerfallen CHEM:

zerfallen
ayrışmak
Präsens
ichzerfalle
duzerfällst
er/sie/eszerfällt
wirzerfallen
ihrzerfallt
siezerfallen
Präteritum
ichzerfiel
duzerfielst
er/sie/eszerfiel
wirzerfielen
ihrzerfielt
siezerfielen
Perfekt
ichbinzerfallen
dubistzerfallen
er/sie/esistzerfallen
wirsindzerfallen
ihrseidzerfallen
siesindzerfallen
Plusquamperfekt
ichwarzerfallen
duwarstzerfallen
er/sie/eswarzerfallen
wirwarenzerfallen
ihrwartzerfallen
siewarenzerfallen
See further verb tables