牛津7下单词表(牛津英语七年级下册目录)
导语:牛津英语7下 Unit 1 Grammar课堂笔记【序数词】
【序数词】
1.概念:表示顺序的词称为序数词。
2.序数词的写法与读法:
(1) 一般来说,是由相应的基数词加词尾th构成。例:
four + th → fourth six + th → sixth
seven + th → seventh ten + th → tenth
(2)下面这些基数词在变为序数词时,有特殊的变化。例:
one → first two → second three → third five → fifth
eight → eighth nine → ninth eleven→eleventh twelve → twelfth
(3)十位整数序数词的构成方法是将基数词的词y变成i,然后再加eth。例:
twenty → twentieth thirty → thirtieth forty → fortieth ninety → ninetieth
(4)两位或两位以上的基数词变成序数词时,仅将个位数变成序数词。例:
twenty-one → twenty-first 21 thirty-five → thirty-fifth 35
3.序数词的用法:
(1)序数词在使用时,一般加上定冠词。例:
The first is larger than the second. (主语) 第一个比第二个大。
Read the book from the first.(宾语) 从开头读这本书。
You’ll be the sixth to write. (表语) 你将是第六个写的。
但如果序数词前已经有其他限定词,则不加the。如:His first name is Mike.
作副词时,不可再用the。 He often comes first in the exams.
You must finish your homework first.
(2)表示顺序、次序。例:the first month of a year
(3)表示日期。例:on the eighth of March
(4)表示编号、楼层。例:the first unit on the sixth floor
(5)表示生日。例:It is his nineteenth birthday today. He is nineteen years old.
(6)表示名次。例:He often comes first in the exams.
(7)序数词的前面可以加上不定冠词,用来表示“再一”,“又一”的意思。例:
You may have a third try. 你可以第三次尝试。
序数词构成 请牢记口诀:
一二三,特殊记 ,加th从四起;八少t , 九少e ,逢五与十二,f 替ve ;
二十到九十,y变ie ; 若是几十几,前基后序要牢记
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