看一下這個就知道了：
一、名詞復(fù)數(shù)的規(guī)則變化
1)一般情況加s.
eg:map-maps bag-bags car-cars
2)以s,sh,ch,x等結(jié)尾的詞加es.
eg:bus-buses watch-watches
3)以ce,se,ze,(d)ge等結(jié)尾的詞加s
eg:license-licenses
4)以輔音字母+y 結(jié)尾的詞變y 為i再加es
eg:baby---babies
二、名詞復(fù)數(shù)的不規(guī)則變化
1）child---children foot---feet tooth---teeth
mouse---mice man---men woman---women
注意：與 man 和 woman構(gòu)成的合成詞,其復(fù)數(shù)形式也是 -men 和-women.
2）單復(fù)同形
eg:deer,sheep,fish,Chinese,Japanese
li,jin,yuan,two li,three mu,four jin
但除人民幣元、角、分外,美元、英鎊、法郎等都有復(fù)數(shù)形式.如:
a dollar,two dollars; a meter,two meters
3）集體名詞,以單數(shù)形式出現(xiàn),但實為復(fù)數(shù).
eg：people police cattle 等本身就是復(fù)數(shù),不能說 a people,a police,a cattle,但可以說
a person,a policeman,a head of cattle,the English,the British,the French,the Chinese,the Japanese,the Swiss 等名詞,表示國民總稱時,作復(fù)數(shù)用.
eg：The Chinese are industries and brave.中國人民是勤勞勇敢的.
4）以s結(jié)尾,仍為單數(shù)的名詞,如：
a.maths,politics,physics等學(xué)科名詞,為不可數(shù)名詞,是單數(shù).
b.news 是不可數(shù)名詞.
c.the United States,the United Nations 應(yīng)視為單數(shù).
The United Nations was organized in 1945.聯(lián)合國是1945年組建起來的.
d.以復(fù)數(shù)形式出現(xiàn)的書名,劇名,報紙,雜志名,也可視為單數(shù).
"The Arabian Nights" is a very interesting story-book.
是一本非常有趣的故事書.
5) 表示由兩部分構(gòu)成的東西,如：glasses (眼鏡) trousers,clothes
若表達具體數(shù)目,要借助數(shù)量詞 pair(對,雙); suit(套); a pair of glasses; two pairs of trousers
6）另外還有一些名詞,其復(fù)數(shù)形式有時可表示特別意思,如：goods貨物,waters水域,fishes（各種）魚
三、
1）當(dāng)there be 句型的主語是一系列事物時,謂語應(yīng)與最鄰近的主語保持一致.
There is a pen,a knife and several books on the desk..
There are twenty boy-students and twenty-three girl-students in the class.
2）當(dāng)either… or… 與neither… nor,連接兩個主語時,謂語動詞與最鄰近的主語保持一致.如果句子是由here,there引導(dǎo),而主語又不止一個時,謂語通常也和最鄰近的主語一致.
Either you or she is to go.
Here is a pen,a few envelops and some paper for you.
3）當(dāng)主語后面跟有with,together with,like,except,but,no less than,as well as 等詞引起的短語時,謂語動詞與前面的主語一致.
The teacher together with some students is visiting the factory.
He as well as I wants to go boating.
四、謂語需用單數(shù)
1） 代詞each和由every,some,no,any等構(gòu)成的復(fù)合代詞作主語,或主語中含有each,every,謂語需用單數(shù).
Each of us has a tape-recorder.
There is something wrong with my watch.
2） 當(dāng)主語是一本書或一條格言時,謂語動詞常用單數(shù).
The Arabian Night is a book known to lovers of English.
是英語愛好者熟悉的一本好書.
3） 表示金錢,時間,價格或度量衡的復(fù)合名詞作主語 時,通常把這些名詞看作一個整體,謂語一般用單數(shù).(用復(fù)數(shù)也可,意思不變.)
Three weeks was allowed for making the necessary preparations.
Ten yuan is enough.