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in the PONS Dictionary

knattern [ˈknatɐn] VB intr

1. knattern (rattern):

knattern

2. knattern AUTO:

knattern
Präsens
ichknattere
duknatterst
er/sie/esknattert
wirknattern
ihrknattert
sieknattern
Präteritum
ichknatterte
duknattertest
er/sie/esknatterte
wirknatterten
ihrknattertet
sieknatterten
Perfekt
ichhabegeknattert
duhastgeknattert
er/sie/eshatgeknattert
wirhabengeknattert
ihrhabtgeknattert
siehabengeknattert
Plusquamperfekt
ichhattegeknattert
duhattestgeknattert
er/sie/eshattegeknattert
wirhattengeknattert
ihrhattetgeknattert
siehattengeknattert