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in the PONS Dictionary

testify [ˈtestɪfaɪ] VB intr

1. testify (make statement):

testify
zeznawać [perf zeznać]

2. testify form (prove):

to testify to sth
świadczyć [perf za-] o czymś
Present
Itestify
youtestify
he/she/ittestifies
wetestify
youtestify
theytestify
Past
Itestified
youtestified
he/she/ittestified
wetestified
youtestified
theytestified
Present Perfect
Ihavetestified
youhavetestified
he/she/ithastestified
wehavetestified
youhavetestified
theyhavetestified
Past Perfect
Ihadtestified
youhadtestified
he/she/ithadtestified
wehadtestified
youhadtestified
theyhadtestified
See further verb tables