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by mistake 弄错的,错误地 sour (adj.)酸的；有酸味的
crispy （adj.)脆的 customer (n.)顾客
Key sentences：
1. Potato chips were invented by mistake.
2. The customer was happy in the end.
3. They were invented in 1863.
4. George wanted to make the customer happy.
技能目标：
1. 正确运用被动语态谈论potato chips 的历史和用途。
2. 掌握一般过去式的被动语态的肯定形式、否定形式和疑问句形式 。
情感态度：
学习我们potato chips的历史，丰富阅历，并提高对生
活质量的认识。
四、教学重点、难点
1. Potato chips were invented by mistake.
2. The customer was happy in the end.
3. They were invented in 1863.
4. George wanted to make the customer happy.
五、教学过程
Step1：1a: T: What’s this? How does it taste?
S: ice cream
sweet
T: What’s this? How does it taste?
S: lemons
sour
Step2:1b T”Write the name of a different food after each word.
Sweet banana, water melon
Crispy fried chicken, potato chips
salty cheese, salted eggs
sour vinegar, lemon