单数句变复数句。
知识梳理】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：
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：
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 )
例题精讲】例1. i am teaching myself computer.
we are teaching ourselves computer.
例2. the child himself draws this picture.
the children themselvesdrawthese pictures.
4. 物主代词由单数变复数：
名词性物主代词：mine ours， yours yours，his/hers/its theirs
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.
巩固练习】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？
10. they like my bikes.
课外拓展】
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.
肯定句变否定句。
知识梳理】
把肯定句改成否定句分以下情况：
句中有be动词的，在be动词后加not；
句中有情态动词的（can ,should，must ，would），在情态动词后面加not；
句中没有be动词和情态动词的，在动词前加don’t或doesn’t ；
句中动词为原形的，加don’t. 如： i like apples. i don’t like apples.
句中动词为三单式的，加doesn’t，并将三单式的动词还原成原形。
如：he likes apples. he doesn’t like apples.
时态为过去时的，要加didn’t 而且动词过去式要改为原形，例：i went to school yesterday. →i didn’t go to school yesterday.
4. 肯定句中的some在否定句中应改为any
如：there are some students in the classroom.
there are not any students in the classroom.
例题精讲】例如：
肯定句和否定句的互换：
肯定句：this is a book.
否定句：this is a book. ,
肯定句变否定句：在后面加上do not或者does not,其余按顺序照抄动词用原形。
肯定句变一般疑问句：在句首加do或者does并大写，其余照抄。注意：动词用原形。
2. 划线部分不能在特殊疑问句**现。
非单三时用do, 单三时用does
非单三肯定句：i like english.
否定句：i like english.
单三肯定句：he likes english.
否定句：he like english.
特殊：1. some变为any。如：
there are some birds in the tree. →there aren't any birds in the tree.
但是，若在表示请邀请。 请求的句子中，some可以不变。如：
would you like some orange juice?
与此相关的一些不定代词如something, somebody等也要进行相应变化。
2. and变为or。如：
i h**e a knife and a ruler. →i don't h**e a knife or a ruler.
3. a lot of (=lots of) 变为many或much。如：
they h**e a lot of friends. （可数名词）→they don't h**e many friends.
there is lots of orange in the bottle. （不可数名词）
there isn't much orange in the bottle.
4. already变为yet。如：
i h**e been there already. →i h**en't been there yet.
巩固练习】一．将下列各句改成否定句。
1. tom’s brother is walking in the park.
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