she is good; she is good at
Ella es buena mientras la tengas contenta.
She's good as long as you keep her happy.
She is good at what she does.
Ella es buena para jugar tenis.
She's good at playing tennis.
Aun así, ella es buena para los idiomas.
Even so, she's good with languages.
She is a good student.
She is a good kisser.
Ella es buena para hablar en inglés, no lo es menos que su hermano.
She is good at speaking English, no less so than her brother.
She's good at skiing.
Ella es buena, Teniente, debería darle una oportunidad.
She's good, Lieutenant, you should give her a chance.