"Vysvětlete tamhletěm dětem, že tady zpívat nemůžou."

Translation: Explain to those children that they cannot sing here.

[sebast1ans]

Spisovný tvar je „nemohou“.

[VladaFu]

Tvar nemůžou je hovorový. Hovorová čeština je součástí spisovné češtiny. Korpus navíc poskytuje více než dost dokladů i z oblasti psaného slova.

[Programen]

Stejně jako "tamhletěm", mimochodem :D

[RichardBul911825]

Why “nemůžou” rather than “nesmějí”? Is it the same, or is it different?

[VladaFu]

nemůžou - cannot

nesmějí - must not

[Clive_Alive]

Is the original Czech sentence wrong? It would make more sense with nesmeji instead of nemuzou.
It makes little sense that children literally, physically, cannot sing somewhere that someone is capable of explaining it.
It does make sense that they must not sing somewhere, e.g. in a graveyard.

I reported it as "other"

[Dona-Pier]

Why was it vysvetli in the exercice just before, and vysvetlete in this one, while both is a command to ask someone tell explain.

Vysvetly tamhletem cloveku
vysvetlete tamhletem detem

Is it because detem is neuter or something?