"The cat is playing with the girl."

Translation: Die Katze spielt mit dem Mädchen.

[Skytale]

Wondering why my translation- 'Die Katze mit dem Mädchen spielt' is incorrect.

[Menschenkind]

It's subject - verb - object, thus your syntax is wrong.

[davisein]

Well, it doesn't need to start with subject as far as I know. But you do need the verb in second position in affirmative sentences

[chrispypatt]

the verb has to go in the second position in this case.