Charlie23 is 'on' a preposition and 'dancing' a gerund obj of prep? No. Here you have 'go' in a catenative construction — two verbs in succession.
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Charlie23is 'on' a preposition and 'dancing' a gerund obj of prep?No. Here you have 'go' in a catenative construction — two verbs in succession. 'go' is a verb, and 'dancing' is a verb (in its -ing form). 'on' can be thought of as an adverb if you wish. The pattern of 'go on' is just like the pattern of 'keep on'.