When does 一会儿 go before / after the verb?
The meaning just differs.
When 一会儿 is used as an adverbial, i.e. before a verb, it means &quot;in a while&quot;, &quot;shortly&quot;. It's understood that the action to be set in the future.

别着急，公交车一会儿就来了 = don't worry, the bus will arrive shortly

When 一会儿 is used as a complement, i.e. after a verb, it means &quot;a little while&quot;, or &quot;a little longer&quot; if 再 is present. It identifies a time duration.

我想看一会儿电视 = I want to watch a bit of TV