1.基數(shù)詞變序數(shù)詞。其規(guī)律為：
1,2,3特殊記，加th從4起 (first,second,third,fourth)
8少t，9去e，千萬別忘記 (eighth,ninth) 逢5逢12，ve變f (fifth,twelfth)
20到90，y要變ie (twentieth,ninetieth) 若是幾十幾，前基后序別倒位 (ninety-first)
2.序數(shù)詞常與定冠詞the 連用。
練習:①Henry has learned eight _________ French words this year.
A.hundred B.hundreds C.hundred of D.hundreds of
②The _________lesson is the most difficult one in Book Two. (twenty)
1,2,3特殊記，加th從4起 (first,second,third,fourth)
8少t，9去e，千萬別忘記 (eighth,ninth) 逢5逢12，ve變f (fifth,twelfth)
20到90，y要變ie (twentieth,ninetieth) 若是幾十幾，前基后序別倒位 (ninety-first)
2.序數(shù)詞常與定冠詞the 連用。
練習:①Henry has learned eight _________ French words this year.
A.hundred B.hundreds C.hundred of D.hundreds of
②The _________lesson is the most difficult one in Book Two. (twenty)