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in the PONS Dictionary

tes·ti·fy <-ie-> [ˈtestɪfaɪ] VB intr

1. testify LAW (give evidence):

testify
[als Zeuge(Zeugin) m (f)] aussagen
testify
to testify against/for sb
to testify on behalf of sb
an jds Stelle [o. für jdn] aussagen
to be called upon to testify
to testify that ...

2. testify (prove):

to testify to sth
von etw dat zeugen form
to testify to sth
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