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There is a traditional representation of a sentence's parts and it's relation called Kellogs-Reeds diagramming method,which is not used in linguistics. There are also linguistic representations like phrase structure grammars.

How do you diagram the following sentence using both methods,the pedagogical and the linguistic depiction:

Evidently,the American campus has become a hatchery for insanity.

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    What a syntax tree for a particular sentence looks like is entirely dependent on what particular theory you are using. For this reason, our Help Center rules out general syntax tree requests as off-topic on this site. – lemontree Feb 15 '17 at 15:01
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    In general, a sentence adverb would usually be placed as an adjunct to the root of the sentence (e.g. IP or CP). – lemontree Feb 15 '17 at 15:08
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    Such a de facto universal phrase structure grammar doesn't exist. – lemontree Feb 15 '17 at 15:19
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    "Evidently" is a supplementary adjunct, more specifically a "speech act-related" adjunct. Supplements don't modify another element; instead they have an "anchor" to which they relate. In your example, the anchor is the entire clause the American campus has become a hatchery for insanity. I could give you a conventional tree diagram, but I wouldn't touch the Reed-Kellogg system with a barge pole! – BillJ Feb 15 '17 at 16:19
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    As a sentence adverb, Evidently would go on an elevated horizontal line above the VP has become; the platform itself would be connected to a dashed vertical line rising between has and become (and having a split fork at the bottom, in certain versions -- there's far more than one; sorry). It works almost as well as making the adverb a higher predicate. Of course, this is the same way one would also diagram has evidently become, except that evidently wouldn't be capitalized in that case. – jlawler Feb 15 '17 at 16:50
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Simplified Tree Diagram of Supplementary Adjunct:

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