"De bewaker rent achter de jongen aan."

Vertaling: The guard runs after the boy.

[stephenpeckhover]

Is "aan" needed here? Isn't having "achter" enough to say "after"?

[El2theK]

Without aan you say that he is running behind the boy, with aan you're saying he's running after/chasing the boy.

[JeremyDeni1]

Behind is toch ook goed in de plaats van after?