Sentence diagramming is a useful tool.
In “Eight Benefits of Greek New Testament Sentence Diagramming,” (Sharper Iron, Mar 19 2020), Randy Leedy writes:
Sentence diagramming comes into its own as a tool that maximizes the exegete’s harvest of information about the aspects of a text’s meaning that are mediated through grammatical structure. Though establishing grammatical structure is only a narrow slice of the total exegetical task, it is of such importance that any analytical device facilitating it deserves attention and frequent use.
https://sharperiron.org/article/eight-benefits-of-greek-new-testament-sentence-diagramming © 2020 Randy Leedy, all rights reserved.
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On the simple and seemingly safe assumptions that establishing grammatical structure is an important exegetical task and that sentence diagramming is a valid method of portraying that structure, some basic benefits of sentence diagramming become obvious and require little elaboration.
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Slowing Down. Among the most important benefits of diagramming is that it forces the exegete to slow down and consider all the grammatical connections within a sentence. And though it does not force him to think deeply (one can hurry even through a laborious task!), it does encourage him to do so.
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Thinking about Syntax. The diagramming process also encourages the exegete, as a step toward validating each grammatical connection his diagram shows, to consider the exact syntactical usage for each possible construction he considers.
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Visualization. One of the most obvious benefits of sentence diagramming is its visual nature, which can be a highly effective aid for grasping overall structure that is much more difficult to comprehend in the abstract.
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Efficient Communication.
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Mutual Profit.
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Word Study.
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Pedagogy.