It is more like a particle of continuation: carry on, hurry on , etc.
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grammarfreak The simplest way to tell which function on it is performing is by its position in the sentence, If it ends the sentence, i.e. she carried onThat would mean 'on; is an adverb in (1) and a preposition in (2).
grammarfreakWe are talking about their grammatical roles in grammar, not preference.I am not sure quite what you mean by that.
fivejedjonBy the way, there are no absolutes here. if a grammarian decides that 'on' is an adverb, then that's what it is in his/her school of grammar. The same goes for grammarians who decide it's a particle or preposition.Move on - adverb
grammarfreakI would call on a preposition in all three.
"make sure the lid is on"
"she burbled on"
"on the table was a water jug"
grammarfreakMove on - adverbThere is fly on your pie - prep.They aren't difficult to understand, are they?There is nothing to understand. You have simply labelled 'on' in two groups of words. Earlier you suggested that its position in the group determined it label, something I questioned.
grammarfreakI think it is best that we don't share our threadsIf you choose to absent yourself from threads in which I choose to participate, that is your choice.