What does "ni sou" mean in ごく自然にそうなる When I Google translate the sentence it says "it will happen very naturally". If I break down the sentence into parts: Goku: very (adverb) Shizen: naturally (adverb) Ni sou: ??? Naru: to become Can someone help explain what the "ni sou" part means?

is the adverb form of . When is attached to the end of -adjs, they are converted into adverbs. Similarly, when is replaced with in -adjs, they also become adverbs.

→
→

= become like that

>
> Become like that naturally.

Also, Google translate is not very useful when it comes to learning Japanese. Maybe try pasting the sentence into a dictionary like jisho.org instead.