ABSTRACT
These are called predicative-only adjectives and often begin with a-. Some other predicative-only adjectives are:
ablaze, abreast, adrift, afloat, afraid, aghast, alert, alike, alone, aloof, ashamed, asleep, awake, aware
It is a matter for your judgement as to how many aspects of this word class you wish to cover. Activities for adjective classes 1-7 are there for your convenience.
