[cmon]

We are bored because she is boring to be with.
Estamos aburridos porque ella es aburrida/su compañía es aburrida.

She is a good girl because she is attentive when someone is speaking.
Ella es una chica buena porque está buena cuando alguien está hablando.

If she didn't think that she was so clever I would be ready to give her the benefit of the doubt.
Si ella no creyera que era tan lista, yo estaría listo darle el beneficio de la duda.

He is ill today because he was bad yesterday.
Él está malo hoy porque era malo ayer.

I know that you are proud but I believe that you are also conceited.
Sé que estás orgulloso pero creo que tambien eres orgulloso.

She is normally pale-complexioned but she was even paler after hearing the bad news.
Normalmente, ella es palida pero estaba más palida después de oir las noticas malas.

We are rich enough to afford tasty and expensive meals.
Somos suficientmentes ricos que pueden permitirnos las comidas que están ricas y caras.

Are you sure that they are safe?
Estás seguro que son seguros?

She is not old, she only looks old because she refuses to take care of herself.
Ella no es vieja, solo está vieja porque niega cuidar de sí misma/niega cuidarse.

It's good that we are alive because we are too lively to be dead.
Es buen que estemos vivos porque somos demasiados vivos estar muerto.