"or surely" is a valid and usable phrase in written English.
It is typically used to introduce a statement or question that expresses doubt, hesitancy, or uncertainty. Example: I'm not entirely sure if Sarah will be at the party tonight, or surely she would have mentioned it to me.
Exact(30)
Their complaints are the hand-waving of pub economics, not serious analysis — 'Surely you don't think executives can be this valuable to firms?', or 'Surely you don't think executives are more important now than they were forty years ago?'.
None thinks it can plunge into a single currency, or, surely, into the EU's farm policy.
Or, surely not, is it the end for Sir Alex Ferguson?
(You can brush up your Yiddish at "Soul Doctor": "mamish," I learned, means "certainly" or "surely").
Presumably, Mr. Bloomberg has broken no laws, or surely you would have said so explicitly.
Or surely, if it's any good it's going to be too expensive.
Similar(30)
"Not tea or coffee or flour, surely?" "Flour?
The souls of Bulawayo or Lahiri or Ozeki surely don't fret in the shadow of London middle-class English.
(10) We use the standard abbreviation 'a.s.' for the wordings 'almost sure' or 'almost surely' throughout the text.
Whether you're wearing a miniature man bag or not, whether Danny Howard or Danny Rampling, surely that's a dance we can all join in on.
The winner has to be Jay or Georgia, surely?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com