最新高中英语-Unit1-Word-power教案-译林牛津版必修4

英语必修4译林牛津Unit 1精品教案（3）Word

●Word power

We’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: Brainstorming

1. 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 mo re 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 suf fix 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:

Prefix Meaning Examples (adjectives)

un- Not unfair, unnecessary, unimportant,

unhappy

in- Not incorrect, invisible, incurable,

inaccurate

dis- showing opposite disable, dishonest, disagree, disappear,

discover

re- do again rewrite, redo, rebuild, react, retel l,

recreate

mis- badly or wrongly misunderstand, misdirect, mistake,

misuse

Step 2: Learning about Word formation

The 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 refer either 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.