> 
> At the bottom of the device is a microphone and a microUSB port for data connections and charging [*(Source)*](http://en.wikipedia.org/wiki/Galaxy_S_4)
> 
> 
> 

*At the bottom of the device* is an adverb of place. Why is the subject of the sentence an adverb? I didn't think adverbs could be subjects!

Or, if it is not the subject, what is it? And why does the verb come right after it, just like a subject?