句子单数 变 句子复数。

可以从以下几个方面进行改变：

1.主格人称代词变成复数人称代词。

I变we

he、she、it 变成they

She is a girl.-They are girls.

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2.is、am -变成are

I am a student . ― We are students .

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3.a /an 去掉

He is a boy.― They are boys.

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4.名词单数变复数。

It is an apple.― They are apples .

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5.this 变these， that 变those

This is a car. -These are cars.

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