modals: may (formal permission)
  may, could, will, would (polite request
  ought to (advice)
  have to (necessity)
  don’t have to (lack of necessity)
would (polite request, invitation)

present real conditionals and “hope”

comparative, superlative, equative adjectives

sequencing words (before, after, then)

prepositions of direction, non-locational

word use
    too/very/enough
    most/almost
    say/tell