As is well known, English spelling is a major problem even to native speakers. In Achiri-Taboh (2018a), I present arguments for a synchronic base-word-based rule for the spelling of shun-words, given the notoriously troubling variation in the spelling of their ending as underlined here in words like fraction, dictation, equation, and persuasion (with a t-form) and extension, collision, and expression (with an s-form). My (2018a) rule is summarized as follows: (1)The Base-Word-Based (BWB) rule for spelling ‘shun’:Use -tion everywhere except when X (X = any of the 7 conditions)See Achiri-Taboh (2018a) for the 7 conditions.

中文翻译：

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英文拼写：超越shun-words的拼写规则

众所周知，即使对母语人士来说，英语拼写也是一个主要问题。在 Achiri-Taboh (2018a) 中，我提出了一个基于同步基词规则的论据，用于拼写顺-单词，考虑到它们结尾的拼写变化出了名的令人不安压裂化,口授化,平等化， 和说服锡安（带有一个吨-形式）和扩展锡安,科利锡安， 和快递锡安（与s-形式）。我的（2018a）规则总结如下：(1)拼写“shun”的基于基词 (BWB) 的规则：使用 -化任何地方，除非 X （X = 7 个条件中的任何一个）有关 7 个条件，请参见 Achiri-Taboh (2018a)。