I meant by 'assigning focus' to change an unmarked end focus (when the focus is on the last non-anaphoric lexical item or name in the clause as in: "Pete just complained about it") for a marked one, as in "It was Tuesday that I saw him".
The topic.. I wanted to know if the focus on each sentence could be at the same time the topic of the clause. For example, in:
"All we did was follow Biff around"
Then the topic is just "All we did"?? And in:
"(Everytime I’ve left) it’s been a fight that sent me out of here"