(
课件网) Unit 3 Our digital lives 主题范畴：人与社会 主题群：科学与技术 子主题： 科学技术与工程，人类发明与创新 Key question How has digital technology changed our lives know some grammar rules of comparative and superlative adjectives. use comparative and superlative adjectives flexibly to compare people or things. express my attitude towards things correctly. Learning objectives 学习目标 At the end of the class, I will be able to: 1. In the 1940s, the first computers were bigger than cars. 2. In Europe, potatoes are more popular than rice. 3. The boy is fatter than his sister. 4. Which student is the youngest in your class, Tom 5. The skirt is the cheapest one in the shop. Look and say Comparative and superlative adjectives When we compare two people or things, we can use the comparative form of the adjective. When we compare more than two people or things, we can use the superlative form of the adjective. While-learning Sophie is tall. Situation Paul is taller than Sophie. Hans is the tallest student in our class. 比较级 最高级 Read the sentences and pay attention to the parts in blue. 形容词 Sophie Paul Hans ＊对两者进行比较时，可以用形容词的比较级形式来表达。 ＊比较三个或三个以上的事物，可以用形容词的最高级形式来表达。 Read the dialogue between Su Mei and Su Wen. Pay attention to the words in red. Su Mei: Oh, what’s this Su Wen: It’s a computer from the 1940s. You know what The first computers were bigger than cars. Nowadays, computers are much smaller and better. Su Mei: I see. Besides size, what else is different Su Wen: Computers today are much faster than before. Su Mei: That must be true. Some computers are even smarter than human beings. Su Wen: No, I don’t think so. I think human beings are the smartest. After all, we invented computers. Adjective Comparative adjective Superlative adjective big bigger biggest smart smarter smartest interesting more interesting most interesting 形容词有三种形式：原级，比较级和最高级，表示形容词说明的性质在程度上的不同。 To form comparative adjectives, we often add -er to an adjective with one or two syllables and use more with adjectives of three or more syllables. We often use than after comparative adjectives. To form superlative adjectives, we often add -est to an adjective with one or two syllables and use most with adjectives of three or more syllables. We usually use the before superlative adjectives. Let’s sum up the rules! 比较级用于两者（人或物）之间，表示“其中一个比另一个更……”或“较……”，后面通常用连词than连接另一个比较的对象。 The apple is bigger than the orange. A 形容词的比较级 taller smaller 1) 一般情况下在词尾加-er。 tall small 2) 以不发音的字母e结尾的单词在词尾加-r。 nice fine nicer finer 一、形容词比较级的构成 3) 以重读闭音节结尾的，且末尾只有一个辅音字母的单词，双写该辅音字母，再加-er。 slim 4) 以“辅音字母+y”结尾的单词，把y变为i，再加-er。 pretty slimmer bigger prettier easier big easy 5) 多音节词和部分双音节词的比较 ... ...
