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We are early.

我们是早的。

You are students.

你们是学生。

They are quiet.

他们是安静的。

be动词肯定的缩写形式如下图：

图片来源于网络

I am=I'm

You are=You're

He is=He's

She is=She's

It is=It's

We are=We're

You are=You're

They are=They're

用be动词的正确形式填空。

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be动词的否定式为：主语 be动词 not 其他。如：

图片来源于网络

I am not sad.

我不伤心。

You aren't at home.

你不在家。

He isn't thirsty.

他不渴。

She isn't a pilot.

她不是飞行员。

It isn't small.

它不小。