Hanyu Pinyin uses abbreviations that simplify it for experienced readers but can confuse newcomers. Keep in mind: pinyin spellings don't always match pronunciation.

  • In three cases, an abbreviation is made by removing a letter:
    • -iou = -iu
    • -uei = -ui
    • -uen = -un
  • Where no ambiguity would arise, vowels with diacritics are written without a diacritic for convenience. The sound [ɛ] (like English red) was originally represented by ê, but everywhere that it occurs, it is replaced.
    • -iê = -ie
    • -iên = -ian
  • If the initial is j, q, or x, replace ü with u.
    • (jqx)-ü = -u
    • (jqx)-üê = -ue
    • (jqx)-üên = -uan
    • (jqx)-ün = -un
  • In most cases, if there is no initial, the spelling is altered to make syllable boundaries unambiguous when syllables are written together. In the case when there's no initial and there is an ü, replace ü with yu.
    • ü = yu
    • üê = yue
    • üên = yuan
  • If there's no initial and the vowel is i (with no diphthong), add a y:
    • i = yi
    • in = yin
    • ing = ying
  • If there's no initial and there is a diphthong beginning with i, replace i with y.
    • iê = ye
    • iên = yan
    • iou = you
    • ia = ya
    • iao = yao
  • If there's no initial and the final is just u, add a w:
    • u = wu
  • If there's no initial and there is a diphthong beginning with u, replace u with w.
    • ua = wa
    • uai = wai
    • uei = wei
    • uan = wan
    • uen = wen

It's also important to remember that -i represents a different sound depending on whether the initial is one of {sh, ch, zh, r}, {z, c, s}, or {b, p, m, d, t, n, l, j, q, x}. There are other differences in the sound that one letter represents between different finals, but these are less misleading.