What is Tom’s context? How does it influence his behaviour in the passages? In the novel?

Prologue (27th April 1926) p. 9. Both Isabel and Tom. Chapter 1 (16th December 1918) Chapter 5 Chapter 26 from page 260 “Tom drank the tea slowly…” to the break in page 255. Chapter 36 page 346 to the break in page 348.