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t字母,因此只加een。,拓展,第三類: twenty 二十 thirty 三十 forty 四十 fifty 五十 sixty 六十 seventy 七十 eighty 八十 ninety 九十 這類基數(shù)詞共有八個。都是十位的整數(shù),均以后綴ty結(jié)尾。其中sixty、seventy、eighty、ninety基本上是在相應(yīng)的基數(shù)詞后面加上后綴ty。但要注意eighty的拼法,eight本身有t字母,因此只加y。,拓展,第四類: 這一類和很簡單,可以看成是一種合成詞。其結(jié)構(gòu)方式是:用十位整數(shù)加上個位整數(shù),其間用連字符號“”連接,表示“幾十幾”。這類基數(shù)詞的變化都是規(guī)則的。如: twentyone 二十一 fortysix 四十六 seventyeight 七十八 ninetyfive 九十五,拓展,,√,Listen again. Circle the things in the picture that Kate and her mom talk about. Check (√) the thing Kate buys. 再聽一遍錄音,在圖中圈出凱特和媽媽談到的物品,在凱特購買的物品上打勾。,Mom: Oh, look. I like that blue sweater. How much is it? Lisa: Fifteen dollars. Oh, look. I like these socks. Mom: Oh, no. I don’t like red. Lisa: Do you like this?,Mom: Mmm, yes, I do, but it’s eleven dollars.,Lisa: Oh. How much is the green sweater? Mom: It’s twenty dollars. But you have a green sweater. Lisa: Mmm.,Mom: Oh, look at these shorts. Lisa: Oh, yes, I like those. How much are they? Mom: Only sixteen d