为什么填as if 而不是although，顺便翻译此句。

因为us和children在这里是同位语us就是children。
妈妈总把我们当成大人似的和我们这些孩子讲话。
as if 是虚拟语气所以后面的BE动词用的也是WERE而不是are.

AS IF

conj.

1. In the same way that it would be if: looked as if she were made of ice.
2. That: It seemed as if the meeting would never end.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

AS IF

Also, as though. As it would be, as in He decided to accept, as if it really mattered, or John scowled as though he were really angry. The first idiom dates from the late 1500s, the variant from the late 1700s. Also see make as if.

source: http://www.dictionary.com

~
Mother always spoke to us children AS IF we were adults.

Mother always spoke to u