什么动词变名词时是以sion结尾?

问题描述:

什么动词变名词时是以sion结尾?
比如divide变是division;expand是expansion;provide是provision.有啥规律?

I never think there is some rules universal to master the english vocabulary呵呵,我就是经常想这种问题。找最简单的规律。