"You sing badly" in Spanish is "Cantas mal". It is pronounced "CON-tahs mall". Please see the Related link below for confirmation of the translation.
canta
voy a cantar
Puedes cantar?
Para cantar
Me encanta a cantar
voy a cantar
A mi familia les gusta cantar (+ 'en espanol' - if you meant 'sing in Spanish')
In Latin: cantare est bis orare ("to sing is to pray twice")In Spanish:
huh? He does not sing badly. He's an amazing singer.
You can say "Voy a cantar".
¿Te gusta cantar?
Ella ama cantar.