The negative case

So for words for things (nouns) that end in 'a' - kawa, herbata, pizza, zupa, etc. - we know that if they come after a verb being used positively the 'a' ending changes to 'ę'

• Gdzie jest pizza?
• Mam pizzę

This situation is known as the Accusative Case - the case of being after a verb that is used positively

Genetive

When we use a verb negatively this is known as the Genetive case:

• Nie lubię - I don't like
• Nie mam - I don't have
• etc.

In this case the 'a' ending changes to 'y'.

• Gdzie jest pizza?
• Nie mam pizzy

• Tu jest kawa
• Nie lubię kawy