Is there a rule I could tell the difference between:
- Both A and B have other attributes that distinguish them more completely.
- Both A and B have other attributes that more completely distinguish them.
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Adverbs and adverbials (the superset, strings modifying verbs) have considerable freedom to appear at various places in sentences. In the that-clause here, 'more completely' is the adverbial, and cannot be separated. It would make sense to have it next to the verb ('distinguish') it modifies:
-1. that more completely distinguish them
-2. *that distinguish more completely them
but the second possibility is unacceptable with a short direct object. This is not the case with a longer following string:
-2'. that distinguish more completely between butterflies and moths
It is more usual, however, to place the adverbial in terminal position after a short string:
-3. that distinguish them more completely