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in the PONS Dictionary

I. warn [wɔ:n, Am wɔ:rn] VB intr

warn
to warn of sth

II. warn [wɔ:n, Am wɔ:rn] VB trans

warn
to warn sb to do sth

warn off VB trans

warn off
to warn sb off doing sth
Present
Iwarn
youwarn
he/she/itwarns
wewarn
youwarn
theywarn
Past
Iwarned
youwarned
he/she/itwarned
wewarned
youwarned
theywarned
Present Perfect
Ihavewarned
youhavewarned
he/she/ithaswarned
wehavewarned
youhavewarned
theyhavewarned
Past Perfect
Ihadwarned
youhadwarned
he/she/ithadwarned
wehadwarned
youhadwarned
theyhadwarned