万丈高楼从平地起,学习也一样。现在孩子们接触英语比较早,但有很多基础性的东西还没完全搞清楚,睿丁英语小编希望孩子们先把基础性的东西打扎实了,那么以后高年级的学习会轻松很多!下面分享下英语知识语法点:基数词、序数词用法:
数词:基数词、序数词
(1)1-20
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen,seventeen,eighteen,nineteen,twenty
(2)21-99 先说“几十”,再说“几”,中间加连字符。
23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one
(3)101—999先说“几百”,再加and,再加末两位数或末位数;
586→five hundred and eighty-six,803→eight hundred and three
(4)1,000以上,先从右往左数,每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion
1,001→one thousand and one
18,423→eighteen thousand,four hundred and twenty-three
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty billion
序数词
(1)一般在基数词后加th
eg: four→fourth,thirteen→thirteenth
(2)不规则变化
one→first,two→second,three→third,five→fifth,eight→eighth,nine→ninth,twelve—twelfth
(3)以y结尾的十位整数,变y为ie再加th
twenty→twentieth, forty→fortieth, ninety→ninetieth
(4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。
twenty-first,two hundred and forty-fifth
基数词转为序数词的口诀:
基变序,有规律,词尾加上-th.
一,二,三,特殊记,词尾字母t,d,d.
八去t,九去e, ve要用f替。
ty将y变成i,th前面有个e.
若是碰到几十几,前用基来后用序。
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