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Discover LudwigThe phrase "so difficult" is correct and usable in written English.
You can use it when you are referring to something that is particularly challenging, e.g. "The problem was so difficult to solve that I didn't know where to start."
Exact(60)
Is that so difficult?
It's so difficult.
Why so difficult?
What is so difficult?
Not so difficult.
Why are you so difficult?
Why is that so difficult?
It is not so difficult".
It doesn't seem so difficult.
Why was that so difficult?
It all became so difficult".
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com