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in the PONS Dictionary

tes·ti·fy <-ie-> [ˈtestɪfaɪ] VB intr

1. testify LAW (give evidence):

[als Zeuge(Zeugin) m (f)] aussagen
an jds Stelle [o. für jdn] aussagen
he testified to having seen the man

2. testify (prove):

von etw dat zeugen form
auf etw acc hindeuten
to testify to sth LAW
to testify that ... person
to testify that ... object
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