No. 997 in Polish
zaczęli
"Zaczęli" means "they started" in English.
In a sentence
Zaczęli spacer po parku.
They started a walk in the park.
The word 'zaczęli' indicates the beginning of an action, specifically starting a walk.
Po obiedzie zaczęli oglądać film.
After lunch, they started watching a movie.
'Zaczęli' in this context shows the commencement of an activity, 'watching a movie'.
Kiedy zaczęli płynąć, woda była spokojna.
When they started swimming, the water was calm.
Here, 'zaczęli' describes the start of an action, which is 'swimming'.
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