英语可数名词的单复数：英语可数名词有单数和复数两种形式。
1、名词由单数变复数的基本方法如下：
①在单数名词词尾加s。如：map → maps,boy→ boys,horse→ horses, table→ tables.
②s,o,x ,sh,ch结尾的词加es.如：class→classes, box→boxes, hero→heroes, dish→dishes, bench→benches.
[注]：少数以o结尾的词,变复数时只加s。如：photo→photos, piano→pianos.
③以辅音字母加y结尾的名词,变y为i,再加es。如：family→families, city→cities, party→parties.
④以f或fe结尾的名词,变f或fe为v,再加es。如：shelf→shelves, wolf→wolves, life→lives, knife→knives.
someday是什么意思2、不规则变化：man→men, woman→women, sheep→sheep,tooth→teeth, fish→fish, child→children, ox→oxen, goose→geese
不可数名词一般没有复数形式,说明其数量时,要用有关计量名词。如：a bag of rice→two bags of rice, a piece of paper→three pieces of paper, a bottle of milk→five bottles of milk.
some和 any 的用法：
some一般用于肯定句中,意思是“几个”、“一些”、“某个”作定语时可修饰可数名词或不可数名词。如：I have some work to do today. (今天我有些事情要做)/ They will go there some day.(他们有朝一日会去那儿)
some 用于疑问句时,表示建议、请求或希望得到肯定回答。如：Would you like some coffee with sugar?(你要加糖的咖啡吗？)
any 一般用于疑问句或否定句中,意思是“任何一些”、“任何一个”,作定语时可修饰可数或不可数名词。如：They didn’t have any friends here. (他们在这里没有朋友)/ Have you got any questions to ask?(你有问题要问吗？)
any 用于肯定句时,意思是“任何的”。Come here with any friend.(随便带什么朋友来
other、the other和another的用法：
other意思是“另一”、“另一些”,有复数形式。在句子中可作主语、宾语和定语。another意思是“另外”、“又一个”,表示增加,在句中可作宾语和定语。如：
Some girls are singing under the big apple tree and others are sitting on the grass talking.(有些女孩在大苹果树下唱歌,别的就躺在草地上说话) / You have had several cakes. Do you really want another one?(你已经吃了好几块蛋糕了,你真的还要一块？) / I want another four books.(我还要四本书)
another(另外的,再一,又一)与the other(另外的一个) 主要从数量上区分,只有两个时用the other,在原先基础上增加用another。如： This is one of your socks. Where is the other one?(这是你的一只袜子,还有一只呢？) / I have eaten 4 cakes, but I still want another.(我已经吃了4块蛋糕,但是我还要一块。)
others与the others的主要区别：others指“剩余的人/物”(指大部分)；the others指“其余的人/物”,(指全部)。如：A few students are playing soccer while others are watching the
m.(有几个学生在踢足球,其他一些人在观看) / Two of the ten boys are standing and the others are sitting round them.(十个男孩中有两个站着,其他人都围着他们坐着。)
who、whom、whose、what、which、whoever、whatever、whichever主要用于特殊疑问句中,一般放在句首。口语中也常用who代替whom作宾语,但在介词后则只能用whom。如：
Who(m) did you invite to your birthday party?(你都邀请了谁参加你的生日聚会的？) / What does she want to be when she grows up?(她长大了想干什么？)
2、who 和whom只能独立使用,其中who可以作句子的主语、表语或动词的宾语,whom只能作谓语动词的宾语；而what、which、whose等既可以独立使用作主语、表语和宾语,也可以与名词构成疑问短语。如： Who is that man?(那男的是谁？) / What colour are their hats?(他们的帽子是什么颜？) / Which car was made in Germany?(哪辆车是德国造的？)(被动句)
注意这个提问：The man in the car is my father.(车里的男人是我父亲)
→Which man is your father?(哪个男人是你的父亲？)
3、which除了可以询问指代的情况之外,还可以针对说明人物的时间、地点、岁数、颜、大小、状况等进行提问。如：People there live a very sad life.(那里的人生活凄惨) →Which people live a sad life? (哪些人生活凄惨？)/ --Which hotel have you booked for your holiday?(为了度假你预订了哪家旅馆？)—The biggest one in Haikou.(海口最大的那家旅馆)
4、疑问代词不分单复数,视它所替代的人或事物决定单复数,但是通常用单数；如果修饰名词,则以名词的单复数为准。如：Who is (are) in that playhouse?(谁在游戏房里？) / What is that? (那是什么？)/ What are those? (那些是什么？) / What colours do they have?(它们有哪些颜？)
基数词：表示数目的词叫基数词。
1、 英语中常用的基数词有：
1 2 3 4 5 6 7 8 9 10 11 12 | one two three four five six seven eight nine ten eleven twelve | 13 14 15 16 17 18 19 | thirteen fourteen fifteen sixteen seventeen eighteen nineteen | 20 30 40 50 60 70 80 90 100 | twenty thirty forty fifty sixty seventy eighty ninety one(a) hundred | 23 35 101 | twenty-three thirty-five one hundred and one |
1000→one(a) thousand,10000→ ten thousand,100000→one hundred thousand ,1000000→one million,10000000→ten million, 100000000→one hundred million,
108→one hundred and eight, 146→one hundred and forty-six, 500→five hundred , 1001→one thousand and one, 1813→one thousand eight hundred and thirteen.
2、[注]：(1)百位与十位之间要加and；十万位和万位,亿位和千万位之间通常也要加and。
(2)英语用千、百万等单位计数,大数字从右向左看, 每隔三位划一逗号,倒数第一个逗号之前要用thousand,倒数第二个逗号之前要用million,倒数第三的逗号之前要用billion表示。
(3) hundred、 thousand、 million作数词时,不用复数,前面可以加上one, two, …等其它数词。用作名词时复数表示“成…上…”,后面必须要有of,前面可以加上some,many,several等词。如：five hundred(五百), hundreds of(成百上千的), ten thousand(一万), thousands of(成千上万的), millions of(成百万的)
3、序数词：表示顺序的数词叫序数词。
1、 英语的序数词基本变法：
(1) 一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词。
2、序数词如下：
1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th | ※first ※second ※third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth | 13th 14th 15th 16th 17th 18th 19th | thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth | 20th 30th 40th 50th 60th 70th 80th 90th 100th | twentieth thirtieth fortieth fiftieth sixtieth seventieth eightieth ninetieth one undredth | 21st 22nd 23rd 35th 101st | twenty-first twenty-second twenty-third thirty-fifth one hundred and first |
1000th→one thousandth, 1000000th →one millionth., 第703→the seven hundred and third,
第5480→the five thousand four hundred and eightieth.
3、注：(1)两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。如：thirty-sixth,
(2) 使用序数词时一般加定冠词the. 如：I’m in the third grade.
(3) 序数词作“几分之几”讲时,有复数形式。如：1/5→one fifth ; 2/3→ two thirds ; 4/7→ four sevenths ; 1/2→ a half ; 1/4→a quarter ; 3/4→ three quarters ; 50%→ fifty hundredths ( fifty per cent).
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