2020-2021学年 人教新课标 高一英语Book 3 unit 4 英语倍数的表达方法 课件

Book3 Unit4 Astronomy: the science of the stars 难点名称：英语倍数的表达方法 高一年级-必修三-第四单元 说课：这次我要进行的难点教学设计的课题是：理解【手性分子】的概念 用“times”表示倍数 （一般限于包括基数在内三倍或三倍以上的数。表示两倍的数用twice） 1.“A + be + 倍数 + as + 形容词或副词原级 + as + B" This tree is three times as tall as that one. 这棵树是那棵树的三倍高。 His father is twice as old as he. 他父亲的年纪有他两倍大。 2.“A + be + 倍数 + 形容词或副词的比较级 + than + B ” The Yangtze River is almost twice longer than the Pearl River. 长江差不多比珠江长两倍。 The dictionary is exactly five times more expensive than that one. 这本字典比那本恰好贵5倍。 3.“A + be + 倍数 + the + 计量名词 + of + B ” The newly broadened square is four times the size of the previous one. 新扩建的广场是未扩建时的四倍大。 计量名词 ：size大, length长, width宽, height高, depth深，weight重 4. “The + 计量名词 + of + A + be + 倍数 + that + of + B” The size of the newly broadened square is four times that of the previous one. 新扩建的广场为以前的四倍大。 5. “ …times + more + 名词+ than… ” He earns five times more money than he did ten years ago. 他现在挣的钱比他十年前挣的多五倍。 There are twice more students in our class than in theirs