is not able to
Él no es capaz de abrir la boca delante de su padre.
He can't open his mouth in front of his father.
Tom no es capaz de encontrar su reloj.
Tom can't find his watch.
No es capaz de hacer nada solo.
He/She is incapable of doing anything on his/her own.
No te burles de él porque no es capaz de escribir su nombre.
Don't make fun of him because he can't write his name.
Él no es capaz de escribir su propio nombre.
He is unable to write his own name.
Ella no es capaz de distinguir entre el bien y el mal.
She is unable to distinguish between good and evil.
Tom no es capaz de nadar tan rápidamente como Mary.
Tom can't swim as fast as Mary.
Que esta no es capaz de tener la boca cerrada.
She's incapable of keeping her mouth shut.
— Todo sobre mi madre (1999)
Tom no es capaz de confesar a Mary sus sentimientos reales.
Tom isn't able to confess his true feelings to Mary.