英语单数句和复数句的转换,

单数句变复数句 单数句变复数句歌谣： 单数句变复数句, 代词四变要记住.
人称,指示,反身变 物主代词看一看.
连系动词 am is 变成 are.
冠词a an要去掉,改为some,any也可以.
名词做定语,介宾不要变；有man和woman也例外.
句式不要变,十全十美题做完.
1人称代词由单数变复数： 1 主格 I we ,you you ,he/she/it they . 2 宾格me us ,you you ,him/her/it them . 例1 She is a girl . They are girls . 例2 I like her. We like them.2 指示代词由单数变复数： this these , that those 例1 This is a book . These are（some）books . 例2 Is that a pen? Are those（any）pens?
3 反身代词：
　 第一人称 myself ourselves
　 　 第二人称 yourself yourselves
　　 第三人称 himself themselves
　　 ( herself, itself ) 例1 I am teaching myself computer. We are teaching ourself computer.
　　
　
　 例2 The child himself draws this picture. The children themselves draw these pictures.
　　
4 物主代词由单数变复数： 1 名词性物主代词：mine ours ,yours yours , his/hers/its theirs 2 形容词性物主代词：my our,your your , his/her/its their 例1 The book is mine. The books are ours. 例2 This is her pen. These are their pens.
5 一般情况下,形容词性物主代词在单数句变复数句时不变. 例1 This is my book . These are my books . 6 当句中形容词性物主代词与句中的主语一致时,形容词性物主代词 应随主语人称的变化而变化, 仍要保持一致. 例1 He likes his bike. They like their bikes.
7 连系动词由单数变复数 ：is/am are 例1 I am a teacher. We are（some） teachers. 8 a/an表示一个,只能用在单数名词前,当单数句变复数句时, 一定要把a/an去掉,或改为some/any. 例1 This is a book . These are（some）books . 例2 Is that a pen? Are those（any）pens? 9 当名词作定语或在介词短语中作介词宾语充当除宾语以外的 其它成分时, 该名词不变. 例1 He is a boy student .They are（some）boy students. （man和woman）除外. 例2 She is a woman worker. They are（some）women workers.
10 单数句变为复数句时,句式不能改变,即单数句是疑问句时, 变为复数句时,仍然是疑问句. 例1 What’s this? What are these? 例2 She likes his bike. They like their bikes. 可数名词的复数形式的部分规则 1 一般情况加s,结尾是清辅音读[s],结尾是浊辅音或元音读[z]. 例：friend→friends; cat→cats; style→styles; sport→sports; piece→pieces 2 以s、x、ch、sh结尾的词,在该词末尾加上后辍-es构成复数. 读[iz]. 例：bus→buses; quiz→quizzes; fox→foxes; match→matches; flash→flashes 3 以辅音字母+y结尾的名词,将y改变为i,再加-es. 读[z]. 例：candy→candies; daisy→daisies; fairy→fairies; lady→ladies; story→stories 4 以-o结尾的名词,有生命的加-es,无生命的加-s构成复数. 读[z]. 例：tomato→tomatoes; potato→potatoes; torpedo→torpedoes;bingo→bingoes （有生命） 例：silo→silos; piano→pianos; photo→photos; macro→macros（无生命） 5 以-f或-fe结尾的名词,多为将-f或-fe改变为-ves,但有例外. 读音变化：尾音[f]改读[vz]. 例：knife→knives; life→lives; leaf→leaves; staff→staves; scarf→scarves 反例：roof→roofs 6 以-ce se ze（d）ge等结尾的名词,加-s,读[z]. 例price—prices case—cases orange—oranges 名词的不规则变化： man→men; woman→women; child→children; people→people; fish→fish; sheep→sheep; deer→deer; foot→feet; mouse→mice; tooth→teeth; 单数句变复数句精炼一 将下列单数句变为复数句 1 This is a book . 2 Is that a pen? 3 She is a girl . 4 I like her. 5 The book is mine. 6 This is her pen. 7 I am a teacher. 8 He is a boy student . 9 She is a woman worker. 10 He likes his bike.二 将下列复数句变为单数句 1 What are these? 2 They like their bikes. 3 These are my books . 4 These are（some）books . 5 Are those（any）pens? 6 They are girls . 7 We like them. 8 These are（some）books . 9 Are those（any）pens? 10They like my bikes.三 将下列名词变为复数形式 map egg apple orange pen box bus girl boy baby knife photo tomato man woman milk water desk table bike 单数句变复数句精炼答案一 将下列单数句变为复数句 1 These are（some）books . 2 Are those（any）pens? 3 They are girls . 4 We like them. 5 The books are ours. 6 These are their pens. 7 We are（some） teachers. 8 They are（some）boy students. 9 They are（some）women workers. 10 They like their bikes. 二 将下列复数句变为单数句 1 What is this? 2 He likes his bike 3 This is my book . 4 This is a book . 5 Is that a pen? 6 She is a girl . 7 I like her. 8 This is a book .. 9 Is that a pen? 10 He likes my bike.三 将下列名词变为复数形式 maps eggs apples oranges pens boxes buses girls boys babies knives photos tomatoes men women milk water desks tables bikes