He did so probably because he was worried about something else.

[99bottles]

He's not angry with you. When he yelled at you earlier, he (probably) did so (probably) because he was worried about something else.

I know that the adverb should go next to what it modifies. In that sentence of mine, I guess it modifies the reason for his behaviour, so it should go in front of because. Then why does the sentence sound so much more natural to me with probably in front of did? Is it just me? And if it's not just me, why is that the case?

 

[jutfrank]

Just put it like this:

When he yelled at you earlier, it was probably because he was worried about something else.