navi1-7  Exercise 2: Adjectives and "is"
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  ngim-a kilvan     a long river    (adjective first: the a is on the end)
  kilvan a-ngim     a long river    (noun first: the a is on the front)
  kilvan ngim lu    The river is long.

The a linker is used in the first two: it joins the adjective to the noun
inside one phrase. The third uses lu, because "long" is the statement being
made about the river, not a description attached to it.