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The phrase "are more difficult than" is correct and usable in written English.
You can use it to compare the difficulty of two or more things, indicating that one is harder than the other.
Example: "These math problems are more difficult than the ones we solved last week."
Alternatives: "are harder than" or "are tougher than".
Exact(57)
As a direct result of this tragedy, Germany created Grenzschutzgruppe 9 (GSG 9) as a police counterterrorism force under the leadership of Lt. Ulrich Wegener, whom I met on one of his trips to the U.S. Are there certain types of negotiations that are more difficult than others?
"These verismo pieces are more difficult than many people realise.
Still, some sales are more difficult than others.
Large-flowered species are more difficult than small-flowered, but the technique is the same.
Even cars, within a given model class, are more difficult than ever to tell apart.
Some second albums are more difficult than others – Mvula's was one of them.
But some of the puzzles are more difficult than any I've previously encountered in the series.
And cultural changes are more difficult than material changes; they take a lot of time.
Similar(3)
This is more difficult than it sounds.
I was more difficult than he was.
French is more difficult than I thought.
Write better and faster with AI suggestions while staying true to your unique style.
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