Questions & Answers about Dzieci biegają szybko po boisku.
Dzieci means children. It is the plural form of dziecko meaning child.
This is an irregular noun, so its plural is not formed in the most predictable way. You just need to learn:
- dziecko = child
- dzieci = children
In this sentence, dzieci is in the nominative plural, because it is the subject of the sentence — the ones doing the action.
Biegają is the 3rd person plural present tense form of biegać, which means to run.
It agrees with dzieci because children is plural.
A quick breakdown:
- ja biegam = I run / am running
- ty biegasz = you run / are running
- on/ona/ono biega = he/she/it runs / is running
- my biegamy = we run / are running
- wy biegacie = you (plural) run / are running
- oni/one biegają = they run / are running
So dzieci biegają = the children run / are running.