klingon_grammar1-2  Exercise 3: English and Non-English Sounds
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Standard English has:

  ng    as in "sing" (Klingon lets it start a word, English does not)
  '     a glottal stop, as in "uh-oh" (not a letter in English, but the
        sound occurs; Scots and Cockney speakers use it for "bottle")

Standard English lacks (with a comparison):

  H     the rasp of Scots "loch", German "Bach"
  gh    the throaty sound of the French or Dutch r; also Arabic "ghayn"
  q     a k made further back: Arabic and Quechua have it
  Q     a q released with friction: related to Georgian and Quechua stops
        (any similar example from your reading is fine)
  tlh   a t and an l said together: Welsh "ll" is similar; Nahuatl "tl"
  D     a d with the tongue tip curled back: found in Hindi and other
        languages of India (see the retroflex sounds in Chapter 2 of
        Introduction to Linguistics)
  S     a curled-back s/sh: found in Mandarin (the "sh" of "shi") and Polish

Many answers are possible; the point is that each sound exists in some
natural language, so none is "impossible", just unfamiliar.