Paragraph Unity

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Paragraph Unity
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• When a paragraph has unity, all the supporting
  sentences discuss only one idea. From beginning
  to end, each sentence is directly related to the
  topic. In some languages, it is acceptable to
  wander away from the topic - to make little side
  trips to ideas that are somewhat, but not
  directly, related to the main topic. In English,
  doing so is not acceptable because it breaks the
  unity of the paragraph.

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• My first apartment was very small. It was a
  studio apartment, so it had only one main room
  and a bathroom. The main room was divided into
  three areas. At one end of it was a kitchenette,
  where I cooked and ate my meals. My
  living/sleeping area was at the opposite end. I
  had just enough space for a bed, a coffee table,
  a floor lamp, and a small television. My study
  area was against the back wall. I lived there for
  two years, but I moved because my landlord raised
  the rent. My apartment was so small that I could
  never invite more than three friends over at the
  same time.