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in the PONS Dictionary

cer·ti·fy <-ie-> [ˈsɜ:tɪfaɪ, Am ˈsɜ:rt̬ə-] VB trans

1. certify (declare as true):

to certify sth
to certify sth LAW
I hereby certify that ... form
to certify sb [as] dead

2. certify (declare mentally ill):

to certify sb
to certify sb insane
Present
Icertify
youcertify
he/she/itcertifies
wecertify
youcertify
theycertify
Past
Icertified
youcertified
he/she/itcertified
wecertified
youcertified
theycertified
Present Perfect
Ihavecertified
youhavecertified
he/she/ithascertified
wehavecertified
youhavecertified
theyhavecertified
Past Perfect
Ihadcertified
youhadcertified
he/she/ithadcertified
wehadcertified
youhadcertified
theyhadcertified