Little words

not

Source:*neProto-Slaviccertain

I knowI'm learning

English

not

Polish

nie

ɲɛ

Cognate· distant (Indo-European)Same source — the sound laws connect them.

In all five languages

BCS script

Latin under Cyrillic

Russian
неne
nʲeinherited
Ukrainian
неne
nɛinherited
Polish
nie
ɲɛinherited
Czech
ne
nɛinherited
Written together with the verb: nevím 'I don't know'.
Bosnian-Croatian-Serbian
neне
neinherited
English
not
Distant English relative: no — English no and the prefix un-, Latin ne- and Slavic *ne share an Indo-European negation.