Questions & Answers about Zij is de derde student.
It can mean either in Dutch, but here it means she because the verb is is, which is singular.
- Zij is = she is
- Zij zijn = they are
So the verb form tells you which meaning is intended.
Both can mean she in this kind of sentence.
- ze is the more common unstressed form in everyday speech
- zij is the stressed or fuller form, and is also common in writing
So both Zij is de derde student and Ze is de derde student are possible, but zij can sound a bit more emphatic or formal.
It is capitalized only because it is the first word of the sentence.
In the middle of a sentence, it would normally be written zij, not Zij.