1.《21世纪大英汉词典》：

[口语]把……排除在外，不算在内：

If you are going to sit up late,you can include me out!

如果你们要很晚才睡，请别把我算在内!    

2.《柯林斯英汉双解大词典》：

to exclude 排除在外[非正式]：

You can include me out of that deal.

以下摘自《外研社英汉多功能词典》：

include out（口，戏谑）将……排除在外（通常用于祈使句）：

Include me out. 不要把我算进去。

【注意】宾语如果是代词，必须放在 out 的前面。

如果用 exclude 表示“将……排除在外”，不能再用 out。

为你回答如下:

(1) include sb/sth out不把某人/某物算在内/列为..一部分

If you want more work done, you can include me out! 要想多干点活可别让我参加。

(2) include sb/sth in 把…列为…的一部分;把…算入

结构为：A be included in B

I had worked hard to be included in a project like this. 

为参与这样的项目,我过去一直努力工作。

The President is expected to include this idea in his education plan.

人们期望总统把这一意见列入他的教育计划当中。

请问为什么不用 exclude out 呢？

继续回答如下

关于不用exclude out原因如下

(1) exclude已经具有将…排除在外或者不包括的含义，不需要再后加加out

(2) exclude 具体用法如下所示

【1】vt.将…排除在外;不包括

The price excludes accommodation.   
价格不含住宿。

The Academy excluded women from its classes.

该学院不招收女学生。

The army should be excluded from political life.

军队不应该涉足政治。

Many of the youngsters feel excluded.

很多年轻人感觉自己被排挤

【2】vt.拒绝;阻止

Closing the windows excludes street noises.   

关窗使街上吵闹的声音不能进来。

Thick curtains help to exclude street noises.
厚窗帘有助于隔绝街上的噪音

The court excluded the improperly obtained evidence.
法院不接受非正常渠道获得的证据

They eat only plant foods, and take care to exclude animal products from other areas of their lives.

他们只吃素食，在生活的其他方面也注意拒绝使用动物产品。

In some schools, Christmas carols are being modified to exclude any reference to Christ.

某些学校正在对圣诞颂歌进行修改，删除提及耶稣的内容。

【3】vt.排除…的可能性;对…不予考虑

The police have excluded the possibility that the kidnappers have run away.  

警方已排除了绑架者逃走的可能性。

I cannot entirely exclude the possibility that some form of pressure was applied to the neck.

我不能完全排除颈部受到某种压迫的可能性。

the pathological evidence, which does not exclude suicide.

不排除自杀可能的病理学证据

【4】vt.阻挡;拒绝；阻止…进入

I mean the last thing we would think about is to exclude the children from this plan.
我的意思是,我们绝不会考虑把孩子们排除在这个计划之外的

This was intended to exclude the direct rays of the sun.

其目的是阻挡直射的太阳光。

They have spent $3 million building fences around the National Park to exclude such pests.

为了阻止这类有害动物进入，他们已经耗资300万美元在国家公园周边建造围栏。