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I am trying to figure out when do we need to use an action verb explicitly and when can we omit it using the (ellipsis concept). For Example:

  • John is taller than Jim [is] (I understood that here is can be omitted)
  • John left earlier than Jim [did] - is it ok to omit the word 'did' - if not, why?
  • Maple trees shed their autumn leaves earlier than oak trees - Is this correct?
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    Just as is can be deleted when its repeated predicate is (*than Jim is tall is ungrammatical, but than Jim is and than Jim are both grammatical), pro-verbal do that occurs in comparative clauses is optionally deletable. This is generally true of chunks of an utterance that are predictable or reconstructable, especially at the beginning or end of the utterance. Aug 13 '20 at 21:44
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The logic of the constrictions you give depends on what I see as “compared switchable subjects”. In each example two sentences are implied. John is tall ; Jim is tall. John and Jim may be switched between the implied sentences. Additionally, there is a comparison of the implied sentences: who is taller?

The logic is clear and the meaning is clear and unambiguous, making the grammar correct.

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