Final answer:The question discusses Englishorthographyrules about the double consonants 'ff' and 'cc', as they appear when combining word roots with suffixes or prefixes, with focus on the use in spelling [f] and how prefixes like 'ad-', 'sub-', and 'ob-' can change in form.Explanation:The query relates to the rules of Englishorthography, specifically thespelling conventionsfor the use of double consonants, such as'ff'and'cc', in various situations. When a word root is followed by the suffix '-o', it forms a combining form (CF). Additionally, there are certain instances where the spelling of[f]becomes 'ff'. This occurs due to theassimilation,twinning, or simple addition of letters in the English language. For example, the word root 'sulfur-' when combined with '-o' leads to 'sulfuro-', as seen in the naming of oxoacids. Similarly, certain prefixes such as 'ad-', 'sub-', and 'ob-' may assimilate to 'ac-', 'suc-', and 'oc-' at the start of stems resulting in a double 'c' ('cc'), corresponding to the sounds [k] or [ks]. Furthermore, doubling consonants is common when we add a suffix that begins with a vowel to a base form that ends in consonant-vowel-consonant (CVC) and has a single vowel sound or a stressed final vowel.Learn more about Spelling Rules for Double Consonants here:brainly.com/question/14696997#SPJ6...

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