Grammar & Punctuation – Qualitative and classifying – English editing.

Some adjectives describe the qualities of a person, thing, or idea: they tell us about its qualities – whether it was large or small, red or green. For example:
a stupendous achievement
an exciting proposal
These are referred to as qualitative adjectives.
Other adjectives help to divide persons, things, or ideas into classes; they tell us which of a number of groups they fall into – nuclear or non-nuclear? annual, biennial, or triennial?
the French language
an annual event
Such classifying adjectives cannot usually be graded and they do not normally have comparative or superlative forms. So it would be odd to say, for example:
It was a very annual event.
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