Breakdown of Moja siostra cierpi na ból głowy, więc dziś odpoczywa w domu.
Questions & Answers about Moja siostra cierpi na ból głowy, więc dziś odpoczywa w domu.
Because moja siostra is the subject of the sentence, so both words are in the nominative case.
- siostra = sister in nominative singular
- moja = my, matching a feminine singular noun in nominative
Polish adjectives and possessive words must agree with the noun in gender, number, and case, so moja siostra is the correct subject form.
Polish does not have articles. There is no direct equivalent of English a or the.
So:
- siostra can mean a sister, the sister, or just sister
- ból głowy can mean a headache or the headache, depending on context
You understand definiteness from context rather than from a separate word.
Cierpieć na means to suffer from.
It is a common pattern in Polish:
- cierpieć na grypę = to suffer from the flu
- cierpieć na bezsenność = to suffer from insomnia
- cierpieć na ból głowy = to suffer from a headache / headaches
The verb cierpieć often sounds a bit stronger or more formal than plain English to have.