小学三年级英语语法：单数句和复数句
单数句和复数句：口诀： 单数句子变，变化规则要记住。
名词代词要变化，am, is要变are。
this, that变成啥，these, those来替它。
he, she, it要变啥，全部变they不用怕。
I要变we莫落下，名词后面把s/es加。
名前冠词去掉它，其余成分原样加。
具体注意下面的六要素：
1．单数主格人称代词要变成相应的复数主格人称代词，即I→we； you→you； she, he, it→they。 如： She is a girl.→They are girls.
2． am, is要变为are。 如： I'm a student. →We are students.
3．不定冠词a, an要去掉。如： He is a boy. →They are boys.
4．普通单数名词要变为复数形式。如： It is a cat. →They are cats.
5．指示代词this, that要变为these, those。如： This is a book.→These are books.
6． man, woman作定语修饰可数名词时，要在 "数"上与被修饰名词保持一致。但其他名词修饰名词表示 "性质"时，不作变化。如：
He is a man doctor.→They are men doctors.
This is an apple tree.→They are apple trees.
单复数相互转换，每空一词(含缩写)。
1. The woman is a nurse.(改为复数句)
The _________ _________ _________.
2. There are some old cars.(改为单数句)
There _________ _________ old _________.
3. He has a new book.(改为复数句)
_________ _________ new _________.
4. Are these your chicks ?(改为单数句)
_______ _______ your _______?
5. Is there a sheep in the playground?(改为复数句)
________ there ________ ________ in the playground?
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