step-son→step-sons晚子; son-in-law→sons-in-law

　　十九、若表達(dá)具體數(shù)目，要借助數(shù)量詞

　　例：pair(對，雙); suit(套); a pair of glasses; two pairs of trousers

　　二十、另外還有一些名詞，其復(fù)數(shù)形式有時(shí)可表示特別意思，

　　例：goods貨物，waters水域，fishes（各種）魚

　　二十一、除人民幣元、角、分外，美元、英鎊、法郎等都有復(fù)數(shù)形式。

　　例：a dollar, two dollars; a meter, two meters

　　以O(shè)結(jié)尾的詞，許多加es構(gòu)成復(fù)數(shù)，特別是一些常用詞如：heroes,potatoes,tomatoes,echoes,tornadoes,torpedoes,dominoes,vetoes,mosquitoes,Negroes,mangoes,buffaloes,volcanoes

　　但下面幾類詞只加s：

　　1.以“元音+o”或“oo”結(jié)尾詞如:videos,radios,studios,folios

　　2.一些外來詞，特別是音樂方面的如：pianos,solos,concertos,tobaccos,mottos,cellos

　　3.一些縮寫詞和專有名詞，如：kilos,photos,memos,micros,Eskimos,Filipnos

　　有個(gè)別詞加兩種詞尾都可以，如：archipelago(e)s,halo(e)s,cargoes(英），cargos(美）

　　名詞由單數(shù)變成復(fù)數(shù)的練習(xí)

　　寫出下列名詞復(fù)數(shù)

　　leaf______ puppy_______ box_______ knife_______ fly______ fox______  bus______  bench_____  brush_____ kiss______ church______ dish_____ ruler______ peach________ glass_____ pencil________ boy______ zoo______ man______ roof_______ sheep_______ knife______ lady______ key______ story______ watch______ bamboo______ city______ family______ day_____ apple_______ eraser______ speech______ thief______ mouse______ fish_____ goose____ people ______ ox_____ Chinese _______ deer _______ foot______ child_______ tooth_______ guy________ hero_______ spy______ boss_____ monkey______ city ______ goat ______ radio ________ horse ______ dog ______

　　用所給的單詞的復(fù)數(shù)的正確形式填空：

　　1>There are so many________(wolf)in the forest.

　　2>There are three ______(chair) in the classroom.

　　3>These _______(tomato) are red.

　　4>______(hero) are great.

　　5>My brother looks after two ______(baby)

　　6>There are some ______(deer) eating the grass.

　　7>My father likes to eat _______(potato).

　　8>Chinese ______(people)like to eat noodles.

　　9>I have a lot of ______(toy) in my bedroom.

　　10>I help my mother wash ______(dish) in the kitchen.

　　11>I have two ______(pencil-box).

　　12>There are some ______(bus)in the street.

　　13>Peter has eight _____(foot).

　　14>Linda has three _______(tooth).

　　15>There are some ______(child) in the garden.

　　16>Michael likes the ______(mouse).

　　17>There are some ______(goose)in the river.

　　18>My uncle and father are _____(man).

　　19>Tom and King are _____(boy).

　　20>Linda has three ______(tooth).

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