Resposta :
Modo afirmativo: Can.
Modo negativo: Can not/ can't.
Modo interrogativo: Para as frases interrogativas, começamos com "can", depois o sujeito e o restantes da frase (can + sujeito + complemento).
- I can answer this question.
I can't answer this question.
- She can play soccer.
Can she play soccer?
- The boys can play the drums.
The boys can't play the drums.