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III.能用过去的被动语态（肯定、否定、及疑问句形式）熟练的谈论某些发明。
IV、学会以写作形式表达创造和发明以及发明对生活的帮助和对生活质量提高．
Difficulties（难点）：
用过去的被动语态（肯定、否定、及疑问句形式）熟练的谈论和书写某些发明。
Teaching steps（教学步骤）
1. Warm-up and revision（课堂热身和复习）
Show Ss the pictures on the screen and play a video about all kinds of inventions .let the students write his favorite inventions ,and the reasons.
Which invention do you like best ? why?
S1; I like smart duvet best----skip making the bed because it makes itself.
S2; I like master pan5 best----cook five items at once.
S3; I like spill not---- prevent your morning coffee from spilling
….
(教学设计说明，通过视频资料，让学生了解更多的发明，开阔视野了解用途，为本节课的三种发明及作用做了初步的铺垫)
get them to talk about the invention of tea and the advantages of tea?
How was tea invented by accident?
boiling water over an open fire
fell into …and remained…
produced a nice smell
tasted the brown water —tea
what’s the advantages of tea ?
It makes people less tired ,clears heats in the human body and helps people lose weight.
(教学设计说明，通过谈论茶的发明和茶的用途复习被动语态和发明的相关句式，为下文讨论薯片的发明以及最后的写作都奠定基础)
2.lead in the new classes (创设情景，导入新课)
Show students some potato chips ,then let the students describe the tastes, they can tell one more word.
T; Can you tell me how the potato chips tastes?
S; They are salty
S; They are crispy.
….
T; Are they sweet? or Are they sour?
S; No.