Little children in school uniforms congregate on the steps.
Kleine kinderen in schooluniformen komen samen op de trap.
The children are waiting for school to start.
De kinderen wachten tot school begint.
The children aren't necessarily waiting for school to start; the could just be congregating on the steps.
De kinderen wachten niet per se op het begin van de school; ze kunnen gewoon samenkomen op de trap.