内容正文:
Unit2 Exploring English The Use of “Negative Prefixes” in Word Formation教案 高中英语外研版必修第一册
I. 教学内容
构词法--派生法中的否定前缀
II. 教学目标
By the end of the class, students are able:
1. come up with the five most widely used negative prefixes and list some examples. (列举5个最常用的否定前缀以及至少4个例子)
2. Summarize the allomorphs of the negative prefix—“in-”(im-; ir-; il-) by observing certain examples.(通过观察得出否定前缀:“in-”的另外3个变体 im-,ir-,il; 并且能够举一反三;)
3. Tell the differences between “ un- ” and “in-” in certain usage.(关注特殊用法“un-”和“in-”在同根形容词和名词中的区别;以及部分“ful-”结尾的形容词的否定为“-less”)
III. 教学重难点
Summarize the allomorphs of the negative prefix—“in-”(im-; ir-; il-) by observing certain examples.(通过观察得出否定前缀:“in-”的另外3个变体 im-,ir-,il; 并且能够举一反三;)
IV. 教学过程
Step 1 Review the major ways of word formation and introduce the focus of this class.
1. abbreviation 缩略法
2. conversion 转化法
3. derivation 派生法
4. compounding 合成法
其中derivation 派生法是通过增加前缀(prefixes)和后缀(suffixes)来构成新的词汇;本节课我们聚焦否定前缀。
Step 2 Summarize the 5 most widely used negative prefixes and come up with some examples.
1. un- : adj.& v.& adv
unlucky; unpopular; unnecessary; unsure; unlock;unfortunately…
2. non-: n.& adj.
non-existence; non-essential; non-electrical; non-violent ;non-smoker; non-profit…
3. dis-: adj.& n.& v
dislike; disagree; discover; disadvantage; dishonest; disappear…
4. mis-: v.& n.
misjudge; misunderstand; misdeed; mislead; misfortune;misspell…
5. in-: adj.& n.& adv
inhuman ; incorrect; indirect ;inaccurate; inconsistently …
Step 3 Special usage of “in-”
1. 由于音同化的影响,还有其它3种词素变体(allomorph):il-(字母l前), im-(字母m,p,b前)和ir-(字母r前).
impossible impolite; improper; imbalance; immeasurable; irregular; irresistible; irresolvable; illogical; illegal;
练习: purity -- impurity; rational -- irrational; literate -- illiterate; moral -- immoral ;
relevant --irrelevant; legible --illegible;
2. im/in开头的单词不再用in-而是用un-.
influential; informative; important; imaginable;
uninfluential; uninformative; unimportant; unimaginable;
练习:
unintelligent; uninterested; u