译林英语5下序数词

序数词变化规则：

一二三特殊记，词尾各是tdd；

th四加起，八去t，九去e，y结尾改ie；

ve结尾变f，five、twelve是两兄弟；

若是遇到几十几，只变个位就可以。

1-30基数词和对应序数词：(抄写2遍：书上一遍，练习本上一遍)

1:one— first
2:two— second
3:three— third
4:four-fourth
5:five— fifth
6:six— sixth
7:seven— seventh
8:eight— eighth
9:nine— ninth
10:ten— tenth
11:eleven— eleventh
12:twelve— twelfth
13:thirteen— thirteenth
14:fourteen— fourteenth
15:fifteen— fifteenth
16:sixteen— sixteenth
17:seventeen— seventeenth
18:eighteen— eighteenth
19:nineteen— nineteenth
20:twenty— twentieth
21:twenty-one— twenty-first
22:twenty-two— twenty-second
23:twenty-three— twenty-third
24:twenty-fuor— twenty-fourth
25:twenty-five— twenty-fifth
26:twenty-six— twenty-sixth
27:twenty-seven— twenty-seventh
28:twenty-eight— twenty-eighth
29:twenty-nine—twenty-ninth
30:thirty—thirtieth

31.thirty-one—thirty-first