Hence, the LMBM lexicon contains neither bound nor free grammatical morphemes both are the responsibility of morphological spelling. Under LMBM, L-derivation takes place in the lexicon. Here lexemes with new lexical meanings are formed from from underived lexemes. Both these derivational types are phonologically realized by an autonomous morphological spelling component located after all syntactic rules but before any phonological rules operate. Neither type of morpheme has any meaning and thus morphemes attribute no meaning to the stems to which they attach.
All meaning is accounted for by the derivation rules.
This immediately explains empty and zero morphemes. Free morphemes , on the other hand, may require syntactic positions since they are ostensibly subject to movement and also often belong to paradigms. I have in mind now such morphemes as free adpositions, auxiliaries, conjunctions, and pronouns. All but conjunctions are themselves subject to inflection. Pronouns like which and who , as well as free auxiliaries seem to move from one syntactic position to another in some languages.