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
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