CONTENTS
FEATURE: A few usable (or useable) tips about two troublesome suffixes
GRAMMAR COACH: Fielding your questions
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For most writers, the beginning sentence of a document is the most difficult to write. After the words begin to flow and the piece of writing begins to take shape, writers may instead find themselves stumbling on some of the endings word endings, that is.
The suffixes "-able" and "-ible," by which a verb ("achieve" or "flex," for example) can be transformed into an adjective ("achievable," "flexible") can create confusion. While some words take the "-able" adjectival suffix (or "-ably" adverbial suffix), others require "-ible" (or "-ibly"). The only certainty is the absence of a firm rule to determine which suffix to use. A couple of methods do exist, but both are susceptible to exceptions. Or should that be susceptable"?
METHOD "A" consists of three guidelines:
A-1. If the "root" noun or verb is a complete word, add "-able" to make it an adjective. Examples:
- accept > acceptable
- commend > commendable
- correct > correctable
- depend > dependable
- laugh > laughable
- predict > predictable (method B fails for this word)
- suit > suitable
- understand > understandable
A-2. If the "root" word ends in a silent letter "e," delete the "e" and then add the suffix "-able" to make it an adjective. Examples:
- achieve > achievable
- advise > advisable
- desire > desirable
- quote > quotable
- value > valuable
A-3. If the "root" is not a complete word, add "-ible" to make it an adjective. Examples:
- admissible
- credible
- divisible
- edible
- perceptible
- permissible
- possible
- susceptible
- visible
The list of exceptions is frustratingly long, however. Rule A-1 goes out the window with these words:
- access > accessible
- combust > combustible
- contempt > contemptible
- convert > convertible
- deduct > deductible
- digest > digestible
- flex > flexible
Rule A-2 is violated by these words:
- charge > chargeable (the "e" is retained for proper pronunciation)
- collapse > collapsible
- manage > manageable (the "e" is retained for proper pronunciation)
- response > responsible
- reverse > reversible
Some words can be spelled either with or without the silent "e," including:
- drivable / driveable
- lovable / loveable
- movable / moveable
- sizable / sizeable
- usable / useable
Rule A-3 is ignored by these words:
- demonstrable (but method B supports this word)
- irritable (method B supports this word)
- inevitable
- navigable (method B supports this word)
- negotiable (method B supports this word)
- penetrable (method B supports this word)
- tolerable (method B supports this word)
METHOD "B" consists of two guidelines:
B-1. If the adjective is related to a noun that ends in "-ation" the suffix "-able" is most likely the proper adjectival form, as shown here:
- commendation > commendable
- consideration > considerable
- demonstration > demonstrable (method A fails for this word)
- irritation > irritable
- navigation > navigable (method A fails for this word)
- negotiation > negotiable (method A fails for this word)
- penetration > penetrable (method A fails for this word)
- toleration > tolerable (method A fails for this word)
- valuation > valuable
B-2. If the adjective is related to a noun that ends in "-ion" the suffix "-ible" is most likely the proper adjectival form, as shown here:
- accession > accessible (method A fails for this word)
- admission > admissible
- conversion > convertible (method A fails for this word)
- digestion > digestible
- division > divisible
- perception > perceptible
- vision > visible
The method B guidelines are somewhat squishy also. For example, the word "correct" (which is related to the noun "correction") defies rule B-2 and turns into "correctable" (which method A supports).
The verb "predict" (which is related to the noun "prediction") ignores the "ion" rule in conversion to the adjective "predictable" (which method A supports).
The adjective "credible" is unrelated to a noun that ends in either "-ation" or "-ion," but rather to the noun "credence." Method B is no help in determining the adjective related to the verb "eat"; it's "edible." Likewise, the adjective "understandable" has no "-ation" or "-ion" corollary; it's related to the noun "understanding." The adjective "dependable" is related to the noun "dependence." And "renewable" correlates to the noun "renewal."
If you're unsure whether an adjective ends with "-able" or "-ible" and you have no dictionary at hand, try to apply either or both of these probability methods. To be sure you're right, though, check a dictionary. Doing so would be well, sensible.
1. Barry S. wrote:
"Which is correct: 'coursework' (one word) or 'course work' (two words)? My Associated Press Stylebook doesn't cover it, and most of the Google references have it as one word. So which is it?"
The grammar coach replies:
You're right to be hesitant about simply letting Google occurrences determine usage because so many people misuse terminology as a result of unwillingness to consult a dictionary.
The AP Stylebook does not contain an entry for "coursework" or "course work." The stylebook's first reference for spelling, style and usage is Webster's New World College Dictionary, which does not include an entry for "coursework" meaning that it should be retained as two words. Likewise, the "closed" (single-word) term does not appear in Merriam-Webster Online, in the American Heritage Dictionary or in the online Cambridge Dictionary of American English but it does appear in the online Compact Oxford English Dictionary.
Somewhat related is the term "class work." Although Webster's New World College Dictionary shows "classmate" and "classroom" as closed terms, it contains no entry for "classwork." The same is true for American Heritage.
Regarding "compound words," The Chicago Manual of Style says "Probably nine out of ten spelling questions that arise in writing or editing concern compound words. Should it be selfseeking or self-seeking? Is the word spelled taxpayer, tax-payer or tax payer closed, hyphenated or open? Most such questions are readily answered by the dictionary. If the compound is used as a noun, the chances are good that it will appear in an unabridged dictionary, in one of the three possible spellings."
We recommend retaining "course work" as two words until Webster accepts it as a closed word.
2. Gary C. wrote:
"An alumna of my business school sent an e-mail message to the dean's office in which she wrote, 'As a MA graduate in Philosophy, and native of [our town], the university plays such an important role in my life. When driving today, I saw a billboard for the university's MBA program. It said something about AN MBA. I am confused and stumped isn't is A MBA? AN is for vowels. This concerns me, for it makes us appear to be uneducated.' So is 'an MBA' proper, or not?"
The grammar coach replies:
Gary, the billboard is correct. Both The Chicago Manual of Style and the Associated Press Stylebook say that the article ("a" or "an") preceding an acronym is determined by the way the acronym or abbreviation is read aloud. Webster's New World College Dictionary further explains that "a" is used before words that begin with a consonant sound or a sounded "h" (as in a degree, a home, a uniform), while "an" is used before words that begin with a vowel sound or a silent "h" (e.g., an egg, an honor, an ultimatum). Phonetically, MBA is pronounced "em-bee-ay" so "an MBA" is correct. The letter "M" is pronounced with an initial vowel sound (em).
If you were spelling out the full name for the degree, the article "a" would be appropriate: "a master of business administration degree." Please consult the February 2009 edition of EditPros News for a more detailed explanation.
Incidentally, the alumna who sent you the e-mail message committed three errors of her own in her sentence "As a MA graduate in Philosophy, and native of [our town], the university plays such an important role in my life." First, you know by now that she should have written "AN MA graduate." Second, the dangling prepositional phrase that begins her sentence declares that the university (the subject of the sentence) is an MA graduate. She should have instead written "As an MA graduate ... I believe the university plays an important role...." Third, because the word "philosophy" was used generically in reference to a field of study or academic discipline, its capitalization was inappropriate.
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