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in the PONS Dictionary

I. demonstrate [ˈdemənstreɪt] VB trans

1. demonstrate t. LAW (prove):

demonstrate
udowadniać [perf udowodnić]
demonstrate
wykazywać [perf wykazać]
to demonstrate sth
dowodzić [perf dowieść] czegoś

2. demonstrate (show):

demonstrate
demonstrować [perf za-]
demonstrate enthusiasm, interest
wykazywać [perf wykazać]
demonstrate bravery
okazywać [perf okazać]
to demonstrate one's knowledge

II. demonstrate [ˈdemənstreɪt] VB intr

to demonstrate against/in support of sth
Present
Idemonstrate
youdemonstrate
he/she/itdemonstrates
wedemonstrate
youdemonstrate
theydemonstrate
Past
Idemonstrated
youdemonstrated
he/she/itdemonstrated
wedemonstrated
youdemonstrated
theydemonstrated
Present Perfect
Ihavedemonstrated
youhavedemonstrated
he/she/ithasdemonstrated
wehavedemonstrated
youhavedemonstrated
theyhavedemonstrated
Past Perfect
Ihaddemonstrated
youhaddemonstrated
he/she/ithaddemonstrated
wehaddemonstrated
youhaddemonstrated
theyhaddemonstrated