This is the 1000th most frequent Czech word.
začaly
"Začaly" means "they began" or "they started" in English.
Here, 'začaly' is used to describe the initiation of an activity, in this case, the appearance of new stores.
Začaly se tady objevovat nové obchody.
New stores started to appear here.
Here, 'začaly' refers to the onset of an observational phenomenon, the disappearance of stars.
Hvězdy začaly pomalu mizet z oblohy.
The stars slowly began to vanish from the sky.
In this sentence, 'začaly' conveys the commencement of an action carried out by a plural subject, the children.