' must be the shortened form of 'the habit which is biting his nails' or another form of it like 'which is' turns into the preposition 'of'. Yes. I think you are on the right track.
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Bamtori I assumed that 'the habit of biting his nails..' must be the shortened form of 'the habit which is biting his nails' or another form of it like 'which is' turns into the preposition 'of'.Yes. I think you are on the right track. The preposition "of" often signals that what follows "of" is a sort of definition or explanation of the word that precedes
BamtoriMore simply put, the "of" phrase (Rather, the "of" phrase and the relative clause are better thought of as alternate ways of grammaticalizing the same idea.Jim, would it be okay if I assumed that you meant that the habit is(=) biting nails by the same idea here?