Will be doing很容易和其他进行时混淆。让我们来区分一下吧：

Compare will be -ing with other continuous forms.
will be doing与其他进行时的比较

（1）

At 10 o'clock yesterday, Sally was in her office. She was working.(past)
昨天的10点，萨里在她办公室里工作着。（过去进行时）

It's 10 o'clock now. She is in her office. She is working. (present)
现在是10点，萨里在她办公室里工作着。（一般进行时）

At 10 o'clock tomorrow; she will be in her office. She will be working.
明天10点，萨里会在她办公室里工作着。（将来进行时）

（2）

We use will be doing in a different way: to talk about complete actions in the future.
我们会用will be doing来谈论未来的完整动作。

A: If you see Sally, can you ask her to phone me?
A：如果你见到了萨里，能告诉她让她打电话给我吗？

B: Sure. I'll be seeing her this evening, so I'll tell her then.
B：当然，我今晚会见到她，到时候会告诉她的。

What time will your friends be arriving tomorrow?
你朋友明天什么时候来？

In these examples will be -ing is similar to the present continuous for the future.
这些例子里will be doing和现在进行时非常相似。

You can use Will you be -ing...? To ask about somebody's plans, especially if you want something or want them to do something.
你能使用will you be doing…?来询问某人的计划，尤其是当你想要或想让别人做些什么的时候。

For example:
举个例子：

1、

A: Will you be passing the post office when you're out?
A：你出门的时候会路过邮局吗？

B: Probably. Why?
可能，怎么了？

A: I need some stamps. Could you get me some?
我需要一些邮票。你能帮我带点吗？

2、

A: Will you be using your bicycle this evening?
A：今晚你会用自行车吗？

B: No. Do you want to borrow it?
不会。你想借？

本篇的辨析到这里就结束了，各位明白了吗？