~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
もともと => originally,by nature,from the start N3
Invariant
~と(も)なると/と(も)なれば => ~Just, whenever, once N1
Condition (hypothetical condition)
~ものとおもう => Believe~ N1
Speculation
ともすると => Perhaps, maybe N3
Base, base
…てもともとだ => originally, by nature, from the start N2
Change the subject of the story
もし~としても/もし~としたって => Assuming; Even if ~ N3
もっとも => but then; although; though ~ N2
とも~とも => Whether A or B N1
Miscellaneous
なんとも => Unimaginable N3
Evaluate
...としても => ...Also N3
Position, perspective
~とおもうまもなく => Suddenly~ N1
Right after...