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