I agree, cerealkillah. However, we are talking about positions of adjectives and there are
. I have copied the following from http://www.oxforddictionaries.com/words/adjectives
"Positions of adjectives
Most adjectives can be used in two positions: attributive adjectives occur before the noun they describe, while predicative adjectives are used after certain verbs:
a black cat - attributive
The cat was black. - predicative "
Therefore, the above example - "Are you a good student?" is the question form for "You are a good student." - attributive, while "Is your teacher Australian?" is the question form for "Your teacher is Australian." - predicative.