Contrastingly, an open class offers possibilities for expansion. Typical open classes such as nouns and verbs can and do get new words often, through the usual means such as compounding, derivation, coining, borrowing, etc.
A closed class may get new items through these same processes, but the change takes much more time. The closed class is normally viewed as part of the core language and is not expected to change. (Most readers no doubt can think of new nouns or verbs entering their lexicon, but it's very unlikely that they can recall any new prepositions or pronouns appearing in the same fashion.)
Words can be divided into two basic classes: (1) lexical or open classwords and (2) function or closedclasswords.
English function words, on the other hand, include determiners, such as the and a(n); auxiliaries, such as might, have, and be; conjunctions, such as and, that, and whether; and degree adverbs, such as very and too.
To use the technical terminology, function words were “projecting to a phrase” or “heading a phrase.” Determiners, for example, came to be regarded as the head of determiner phrases--that is, the rabbit was now interpreted as a determiner phrase the.
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