+255.+ You remember we found in the study of pronouns that we have
interrogative pronouns which we use in asking questions when we do not
know the name of the object concerning which we are asking. We also have
adjectives which we use in asking questions when we do not know the
number or quality of the object concerning which we are asking. For
example:
_Which_ book did you enjoy most?
_What_ work are you doing now?
_What_ machine did you order?
_Which_ and _what_ are the interrogative adjectives in these sentences.
+Interrogative adjectives are adjectives used in asking questions.+