De lachende kinderen spelen buiten.
English: The laughing children are playing outside.
In Dutch, 'bijvoeglijk gebruikte onvoltooid deelwoorden' are present participles used as adjectives. They describe a noun by showing that something is happening.
Use this form to describe a noun that is doing something at the same time. It shows that the action is happening now or continuously.
De lachende kinderen spelen buiten.
English: The laughing children are playing outside.
Ik zie een rennende hond.
English: I see a running dog.
De brandende kaars staat op tafel.
English: The burning candle is on the table.
Hij heeft een zwemmende kat gezien.
English: He has seen a swimming cat.