A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main subject, David Herbert Lawrence. It gives a clear overview of who he is without needing other sentences for context. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'He', which is a pronoun and needs context. Paragraph 3 also starts with 'The hero', which refers back to someone not yet introduced. Paragraph 4 starts with 'This', which needs prior context. Paragraph 5 starts with 'The hero', which again needs context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about David Herbert Lawrence and his work. It introduces the main character from his novel, which connects back to his writing. This follows the Summary Style rule, as it brings together the earlier points about his life and work.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues to talk about David Herbert Lawrence. This follows the Logical Order rule, as it gives more information about his early life.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows the next step in his life after university. This follows the Chronological Order rule, as it shows the sequence of events in his life.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it gives more details about his life and relationships. This follows the Broader to Specific Strategy, as it provides specific details about his childhood after mentioning his writing.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it introduces the main character of his novel, Paul Morel. This follows the Topic Example rule, as it gives an example from his writing after discussing his life.