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in the PONS Dictionary

attester [atɛste] VB trans

1. attester (certifier):

attester qc/que qn a fait qc

2. attester (certifier par écrit):

attester qc/que qn a fait qc

3. attester (être la preuve):

attester qc/que qn a fait qc

4. attester LING:

Présent
j'atteste
tuattestes
il/elle/onatteste
nousattestons
vousattestez
ils/ellesattestent
Imparfait
j'attestais
tuattestais
il/elle/onattestait
nousattestions
vousattestiez
ils/ellesattestaient
Passé simple
j'attestai
tuattestas
il/elle/onattesta
nousattestâmes
vousattestâtes
ils/ellesattestèrent
Futur simple
j'attesterai
tuattesteras
il/elle/onattestera
nousattesterons
vousattesterez
ils/ellesattesteront