those are some cars变为单数句子

those“那些”对应的“那个”that
are 单数is
some“一些”对应“一个”a
cars 单数形式car
变为单数形式的句子为：That is a car.

those are some cars变为单数句子是

That is a car.

名词动词代词都要改。

回答和翻译如下:
This is a car.
这是一辆车子。(英语句子翻译，改为单数句翻译)

That is a cars.

这个句子的单数形式是：
That is a car.

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