So +adverbial modifier + subject expressed by a noun or pronoun

e.g. He (the man) spoke so excitedly that we could hardly understand him. – So excitedlydidhe (the man)

speak that we could hardly understand him.

C.1.He ran so quickly the I couldn’t catch him (Hornby). 2. Marigny looked at him so fixedly that he waited to hear what the others had to say (Tracy). He worries so much about his position that he cannot sleep at night (Hornby). 4. Sir Wigmore started so violently that he knocked his brief over the head of the Clerk to the House of Lords sitting below him (Sayers).