單數句變複數句是七年級英語試題中的一個題型. 記住以下幾要素即可迎刃而解：

1、人稱代詞主格單數變成相應的人稱代詞主格複數，即I-we; you-you; she/he/it-they

She is a girl. -They are girls.

2、 am, is變為are.

I am a student. We are students.

3、 不定冠詞a/an要去掉或者變為some, any(肯定句及希望得到對方肯定回答的疑問句用some, 否定和疑問句用any)如：

He is a boy. They are (some) boys.

4、普通單數名詞要變為複數形式。

It is a cat. They are cats.

5、指示代詞this, that變為these, those.如：

This is a book. These are books.

6、Man, woman做定語修飾可數名詞時，要在“數”上與被修飾名詞保持一緻，但其他名詞修飾名詞表示“性質”時，不作變化。如：

This is a woman doctor.

They are women doctors.

This is an ornage tree.

They are ornage trees.

7、反身單詞也要變相應的複數形式。

myself-ourselves yourself-yourselves himself/herself/itself-themselves

I am teaching myself computer.

We are teaching ourselves computer.

8、物主代詞由單數變複數：

名詞性物主代詞：mine-ours yours-yours his/hers/its-theirs

形容詞性主代詞：my-our your-you his/her/its-their

This book is mine.—The books are ours.

This is her pen. – These are their pens.

一般情況下，形容詞性物主代詞在單數句變複數句時不變。當句中形容詞性物主代詞與句中的主語一緻時，形容詞性物主代詞應随主語人稱的變化而變化，仍要保持一緻。

This is my pen. These are my pens.

He likes his bike. They like their bikes.

注意：單數句變為複數句時，句中的形容詞、定冠詞、副詞、疑問詞、介詞短語和感歎詞等保持不變。例如： Who is she? Who are they？

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