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fif-, twelf-,eigh-, nin-
三.第20--第90：y
ie
+th
四.第21--第99:
十位基数词
__
个位序数词
基变序，有规律，词尾加上th. 1 2 3 ;t，d，d。 8 少 t， 9 去 e，v e 变f。 整十变y为ie。
要是几十几，只变个位就可以。
twenty -------twentieth
Twenty –one twenty---first
Dates:
Writing(写法）
Reading （读法）
January 1st /Jan. 1st
August 2nd /Aug. 2nd
July 3rd /Jul. 3rd
February 12th /Feb. 12th
October 20th /Oct. 20th
December 25th /Dec. 25th
January the first
August the second
July the third
February the twelfth
October the twentieth
December the twenty-fifth
Let’s challenge ourselves.
Please read out the dates as quickly as possible.
2月1日