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The part of the sentence "experts have warned that" is correct and usable in written English.
You can use it when introducing a warning or concern that has been expressed by an expert or experts in a particular field. For example: "Experts have warned that climate change will cause significant environmental damage in the next few decades."
Exact(60)
Experts have warned that such tensions could easily escalate.
American officials and terrorism experts have warned that this is not the end of Al Qaeda.
It is old and American experts have warned that it could run into problems.
Anti-doping experts have warned that players who are microdosing could slip through the net.
Experts have warned that these unmarried "bare branches" pose a threat to social stability.
Pensions experts have warned that a legal battle about the BHS scheme could take years.
But several experts have warned that the new zero tolerance strategy is risking institutionalised inequality.
7.37pm: Experts have warned that the Conservative's big society plans could increase corruption.
Privacy experts have warned that plugging information into an online form could lead to problems.
Further, experts have warned that the city faces $200 million or more in civil liabilities.
Experts have warned that releasing the names could prejudice a police inquiry.
More suggestions(15)
researchers have warned that
experts have recommended that
economists have warned that
scientists have warned that
experts have asserted that
educators have warned that
representatives have warned that
experts have noticed that
critics have warned that
experts have advised that
experts have argued that
experts have defended that
experts have claimed that
experts have believed that
experts have speculated that
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