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Discover LudwigSuggestions(5)
The phrase "that is difficult" is correct and can be used in written English.
You can use it when you are describing a task or situation as challenging. For example: "The project seemed simple at first, but with the tight deadline and ever-changing requirements, it quickly became clear that it was a task that is difficult."
Exact(60)
In practice, that is difficult.
"And it's the latter that is difficult".
In this town, that is difficult.
"Now that is a world that is difficult".
It is the last 2 percent that is difficult".
But as a practical matter, that is difficult.
For now, vasectomy remains a permanent "off" switch that is difficult to turn back on.
Legal and illegal acts form a skein that is difficult to disentangle.
It's an article of faith that is difficult to empirically verify.
"I said 'Chandra that is difficult'.
But there is one statistic that is difficult to dispute.
More suggestions(21)
investments that are difficult
that is serious
that is arduous
that is laborious
that is sticky
that is delicate
that is awkward
that is knotty
that is harsh
that is tricky
that prove difficult
that is rugged
that is tough
that is challenging
that is troublesome
that is complex
that is problematic
that is unlikely
that become difficult
that makes difficult
that is tiring
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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