In compiling a grammatical text we were faced with the problem of finding
numerous example sentences to illustrate semantic differences. We had
some problems with finding a good example for contrastive adjectives.
Eventually we settled on the sentence:
These are biological not chemical weapons.
Our first example was:
They hired a criminal not a corporate lawyer.
Unfortunately, non-linguists had a hard time realizing that we meant
"criminal" to be an adjective and not a noun ...
(From the "Rest" of RHF)