"Zijn de kinderen aan het fietsen?"

Translation: Are the children biking?

[caroline884506]

Cycling is the same word than biking, no?

[Nierls]

Yes, you can see that by hovering over the word.

[LesRial]

The given translation seems odd to my UK ears. While not a literal translation from the Dutch, I would probably use the expression 'to ride a bike'. Of course, I might just be old-fashioned :-).

[jimghunter]

In American English is would be more common to say "Are the children riding?"

[StefVanGorp]

The children are biking?
Is also a possibility.

[Nierls]

No, it's a question, the equivalent of your question would be "de kinderen zijn aan het fietsen?" Implying you wouldn't expect them to be biking right now.