我爱记单词lesson 17.

Lesson 17 字母组合（七）
常见发音有变化的辅音字母组合
教学目标：
1. 了解关于发音变化的辅音字母组合形式；
2. 记忆发音变化的辅音字母组合的发音；
3. 结合本课与前面的知识实际拼读陌生单词。

Part One Revison （5 min）
T: Last time we have learned the “re” syllable of vowel letters, let’s review them together.（上次课我们学习了元音字母的re音节，我们一起来复习一下）who can read these words?
fare mere where tired tore cure sure
Part two Presentation (30min)
Step One
Let’s read and fill
T:Now, please read the following words loudly.The fist group ,one two.(现在请同学们读出下面的单词，第一组)
S:/DZt//OIn/
T: What is “th” pronouced?
S:/D//O/
T: And where is it?
S:词首
T:Great.
(以下三组的引导同上，略)
T:Ok,look at the fifth group.According to the form above,who could read the first word?(现在看第五组，根据上面的表，哪位同学告诉我第一个单词怎么读？)
S:/hu:z/ or /hu:s/
T: Wonderful.How did you pronouce this word?(你是怎样读出这个单词的？)
S:wh在o前发/h/, s在元音字母前有两种发音/s/,/z/
T:The correct answer is /hu:z/.Next one?
S:/weIl/
T:Excellent. How could you make it?
S:wh不在字母o前都发/w/ 辅组元辅e 的结构属于开音节，所以a 发/eI/ ，l /l/ e不发音。

（第六组引导同上，略）
T:Now let’s chant.
记忆 th,ch,wh,ng的口诀
字母组合th，位于单词首、中、尾
一对摩擦音牢记，/O//O//O/，/D//D//D/
字母组合ch，位于单词首、中、尾
两种发音记心间，/tS//tS//tS/，/k//k//k/,
wh永开头，位于o前就发/h/
其他情况都发/w/
ng谦虚不开头
词中/YG/,词尾/Y/
Step two
Let’s complete, read and compare
让学生把ch, th, wh, ng分别填到各自轮盘的空格处，并读出所有的单词。

T: Now look at the following pictures, fill in the blanks with the corresponding letter combinations. (观察下列图片，把字母组合填到对应的空格里) Finished?
T: Good. Now look at the first chart, what does “there” pronounce? (现在看第一幅图，“there”怎么读？)
S: /DeE/
T: Good, now tell me “thank” pronounces? (那“thank”怎么读呢？)
S: /OZYk/
T: “then” pronounces?(“then”怎么读？)
S: /Den/.
T: “north” pronounces? (“north”怎么读？)
S: /nC:O/.
T: “than” pronounces? (“than”怎么读？)
S: /DZn/
T: “thick” pronounces? (“thick”怎么读？)
S: /OIk/
T: Now look at the second chart, what does “chess” pronounce?（现在看第二个图，“chess”怎么读？）
S: /tSes/
T: Good, now tell me “chemist” pronounces? (那“chemist”怎么读呢？) S: /kemIst/
T: “much” pronounces? (“much”怎么读？)
S: /mVtS/.
T: “chick” pronounces? (“chick”怎么读？)
S: /tSIk/.
T: “tech” pronounces? (“tech”怎么读？)
S: /tek/
这里注意一下，“ch” 和“th”的发音无规则判断到底什么时候发什么音，需要通过自己的积累去掌握单词。

一般情况下，“ch”在词首大多发/tS/, 在词中大多发/k/，在词尾几乎都发/tS/;
“th”无规律可循。

T: Good. Now look at the third chart. We have learned the pronunciation
of “ng”. What does “ng” pronounce in the middle of a word? (看第三幅图，我们刚才学过“ng”的发音. “ng”在词中发什么音？)
S: /YG/
T: What about in the end of a word?(在词尾呢？)
S: /Y/
T: That’s right. So “ring” pronounces? (那“ring”怎么读呢？)
S: /rIY/
T: “king” pronounces? (那“king”怎么读呢？)
S: /kIY/
T: “wing” pronounces? (那“wing”怎么读呢？)
S: /wIY/
T: “song” pronounces? (那“song”怎么读呢？)
S: /sFY/
T: “sing” pronounces? (那“sing”怎么读呢？)
S: /sIY/
T: “english” pronounces? (那“english”怎么读呢？)
S: /?IYGlIS/
T: We have learned that there are two pronunciations of “wh” at the beginning of a word. They are?(我们刚才学过“wh”在词首有两种发音，分别是什么？)
S: /w/ and /h/
T: Good. What does “white” pronounce? (那“white”怎么读呢？)
S: /waIt/
T: “who” pronounces? (那“who”怎么读呢？)
S: /hu:/
T: What does “wh” pronounce here?(“wh”在这里发什么音？)
S: /h/
T: What’s letter after “wh”? (“wh”之后的字母是什么？)
S: o
T: Remember that “wh” pronounces /h/ when it’s before letter “o”. If not, the pronunciation is /w/. Now tell me “when” pronounces? (记住“wh”在“o”
字母之前时发/w/. 现在告诉我“when”怎么读？)
S: /wen/.
T: “whole” pronounces? ( “whole” 怎么读呢？)
S: /hEHl/
T: “where” pronounces? (“where” 怎么读呢？)
S: /weE/
T: “whom” pronounces? ( “whom” 怎么读呢？)
S: /hu:m/
T: Good. What does “wh” pronounce before letter “o”? (“wh”在“o”字母之前
时发什么音？)
S: /h/.
T: If not?(如果不在“o”之前呢？)
S: /w/
Step Three
Let’s conclude
答案：“th”在词首，词中和词尾均会出现，发/O/或/D/
“ch”在词首，词中和词尾均会出现，发/tS/或/k/
“wh”只出现在词首，不出现在词中和词尾，在字母“o”前发/h/；其余发/w/
“ng”少数出现在词中，发/YG/，一般出现在词尾发/Y/（其实就相当于字母“n”的发音，字母“n”在/k///G/音前发/Y/）。