"Saskia is a student."
Translation:Saskia is studente.
That's because in English you can only say "Saskia is a student", but in Dutch this is a special case: "Saskia is een studente" or "Saskia is studente" is both correct.
For example, if I translate "Saskia is a girl", I have to translate it into "Saskia is een meisje". Not Saskia is meisje.
So, notice how student is a special case, and normally you translate 'a' into 'een'. If you find this difficult, just translate "Saskia is een student(e)", that's always right :)