英语必修ⅳ译林牛津版unit1wordpower教案

●Word powerWe’ll learn in this section some common suffixes that can be added to nouns or verbs to create adjectives. And also some vocabulary related to sales and marketing.Step 1: Brainstorming1. Please think about the following questions:How are the following words formed?health (noun) healthy(adjective) interest (verb) interesting (adjective)An English word can have several derivatives. And please pay attention to the fact that many English words share the same root word, even though they have different meanings or parts of speech.Now here’s more example for you to better understand word formation.breath (n.) breathe (v.) breathless (adj.)act (v.) action (n.) actor (n.) actress (n.) activity (n.)possible (adj.) impossible (adj.) possibility (n.) possibly (adv.)friend (n.), friendly (adj.), friendless (adj.), friendship (n.), unfriendly (adj.) As you can see, many words are derived by adding suffixes or prefixes to the root words. Often you may come across unfamiliar words while reading, try to use knowledge of word formation to guess their meanings. Will you? And can you give more examples about word formation?2. Shall we have a competition to see who can give more examples or create more words by adding suffixes or prefixes to the root words?3. As we know, sometimes an English word can be made up of three parts: a prefix, a stem and a suffix. A stem is the main part of a word. A prefix is a group of letters added to the beginning of a word. A suffix is a group of letters placed at the end of a word. Both prefixes and suffixes modify the meaning of a word or change it into a different word group. The following is a table of common prefixes:Step 2: Learning about Word formationThe basic part of any word is the root; to it, you can add a prefix at the beginning and/or a suffix at the end to change the meaning. For example, in the word "un flatter ing," the root is simply "flatter," while the prefix "un-" makes the word negative, and the suffix "-ing" changes it from a verb into an adjective (specifically, a participle).English itself does not use prefixes as heavily as it once did, but many English words come from Latin, which uses prefixes and suffixes (you can use the word affix to refereither to a prefix or a suffix) quite extensively. For example, the words "prefix," "suffix," and "affix" themselves are all formed from "fix" by the use of prefixes: •"ad" (to) + "fix" (attached) = "affix"•"pre" (before) + "fix" = "prefix"•"sub" (under) + "fix" = "suffix"Note that both the "-d" of "ad" and the "-b" of "sub" change the last letter.Here are some of the most common Latin prefixes (for the meanings of the Latin roots, look up the words in a good dictionary):ab (away) abrupt, absent, absolvead (to) adverb, advertisement, afflictin (not) incapable, indecisive, intolerableinter (between, among) intercept, interdependent, interprovincialintra (within) intramural, intrapersonal, intraprovincialpre (before) prefabricate, preface preferpost (after) postpone, postscript, postwarsub (under) submarine, subscription, suspecttrans (across) transfer, transit, translateStep 3: Ready used materials for Word formationZero MorphemesSome affixes consist of no sounds at all. Zero morphemes DO exist, and we'll see why, and illustrate another concept, allomorphy at the same time.Consider the following words:Adjective Verbyellow yellowbrown browngreen greenpurple purpleThe relation between "yellow" (adjective) and "yellow" (verb) is exactly the same as that between "white" and "whiten", which we just considered. But the form of "yellow" doesn't change. So we say that we added a zero suffix:Verb/ \Adjective -Ø|yellowMeaning: "to make (more) yellow"Zero morphemes are obviously hard to spot because you can't hear them! In these cases you have to notice what ISN'T there. (Sherlock Holmes solves one of his cases by noticing that a dog DIDN'T bark. This was important because there was a situation where any dog would have barked. This is the kind of thinking you have to do to find zero morphemes.)AllomorphyBut now we have two ways to make Adjectives into Verbs meaning "to make (more) Adjective": "-en" ("black-en") and "-Ø" ("yellow-Ø") How do we know which rule to use? That is, why not "yellow-en"?One possible (but uninteresting) answer is that we just have to memorize which affix to use for each stem. That is, we just memorize that "black" takes "-en" and "yellow" takes "-Ø". But we would like a better explanation.As with the phonology problems, the best place to look is "near" where the affix attaches. Since "-en" is a suffix, let's look at the end of the stems. What we find is that we can divide the Adjectives into two classes based on what the last SOUND (NOT letter) of the stem is:•Use "-en" if the last sound is:[p] "deep-en" [f] "stiff-en" [v] "live-en" [t] "white-en"[d] "redd-en" [s] "less-en" [ʃ] "fresh-en" [k] "dark-en"•Use "-Ø" if the last sound is:[e] "gray-Ø" ("His hair grayed (gray-Ø-ed) before he was twenty.")[n] "brown-Ø" [m] "dim-Ø" [l] "purple-Ø" [r] "clear-Ø"We can use the same type of diagrams, and indicate the conditions:Verb/ \Adjective -en if Adjective ends in an obstruent (oral stop or fricative)-Ø if Adjective ends in a sonorant (nasals, approximants, vowels) Meaning: "to make (more) Adjective"When we did phonology problems, we had a notion of "default" or "elsewhere". The same concept can arise in morphology, although in this case the choice is made difficult by the clean cut between obstruents and sonorants. It is true, however, that there are exceptions to this rule with certain unusual adjectives:Verb/ \Adjective -en if Adjective ends in an obstruent (oral stop or fricative)-Ø El sewhereMeaning: "to make (more) Adjective"Another example of allomorphy in English is the choice of the negative prefix "il-/ir-/im-/in-". The rules are:•Use "il-" when the stem begins with "l": "il-legal"•Use "ir-" when the stem begins with "r": "ir-responsible"•Use "im-" when the stem begins with "m, b, p": "im-mobile" "im-balanced", "im-possible"•Otherwise (elsewhere) use "in-": "in-active", etc.In a diagram:Adjective/ \when Adjective begins with l: il- Adjectivewhen Adjective begins with r: ir-when Adjective begins with a bilabial: im-Elsewhere: in-Meaning: "not Adjective"Notice here that there is a clear case that applies when the other (more specific) rules cannot. This is the DEFAULT or ELSEWHERE rule. The ELSEWHERE concept plays an important role in linguistics and we have already encountered it in phonology and we will encounter it again in this course.Finally, some allomorphy is simply exceptional. There are morphemes which are used with only a limited number of words, such as plural "-en" as in "ox-en", "child-(r)en".Furthermore, some words are so irregular that they have no internal analysis, for example "went" is the SUPPLETIVE form for what would otherwise be "go-ed". Children oftenuse words like "go-ed" ("went") or "hold-ed" ("held"). These are called OVERGENERALIZATION errors because the children use a regular productive process on exceptional words.Other ways of Forming Words •Back formationsWhere one "falsely" uses a rule."peddler" refers to a personanalyze "peddler" as "peddle" + "-er"•Blends: "smoke" + "fog" = "smog"; "motor" + "hotel" = "motel"•Words from Names: "jumbo", "sandwich"•Truncation (Clipping): "gym(nasium)", "(tele)phone" Acronyms: "AIDS" = "Acquired Immune Deficiency Syndrome"。