Sentence:  This is an observation I make in Jefferies (1990) in connection with certain allomorphs of the copulative, 'possessive' and some of the adverbialising prefixes in Shona, where, again, these <WSD>inflectors</WSD> depend on 'their' stems for vowel shape and how their underlying high tones are realised. 
Meaning of the word marked with <WSD> tags:  An affix that inflects the base form of a word.