Questions & Answers about На завтрак я ем манную кашу.
No. In Russian, на + accusative is often used with meals to mean for that meal:
- на завтрак = for breakfast
- на обед = for lunch
- на ужин = for dinner/supper
So На завтрак я ем манную кашу means For breakfast, I eat semolina porridge.
This is just an idiomatic Russian pattern. It does not mean physically on breakfast.
Because after на in the meaning for (a purpose / occasion), Russian uses the accusative case.
The noun завтрак is masculine and inanimate. For many masculine inanimate nouns, the accusative singular looks the same as the nominative singular:
- nominative: завтрак
- accusative: завтрак
So although the form does not change, it is still accusative here.