Three for three. Do you understand why 2 is obligatory?
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In spite of his being busy – non-obligatory? No it is obligatory adverbial.
2. But for you I wouldn’t be here at all.
But for you – obligatory No it is not obligatory
3. Everybody was present except Jane.
Except Jane - non-obligatory? Yes it is non obligatory since it does not change the sentence meaning