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The phrase "are extremely useful" is correct and usable in written English.
You can use it to emphasize the high level of usefulness of a particular item, concept, or tool in various contexts.
Example: "These new software tools are extremely useful for improving productivity in the workplace."
Alternatives: "are highly beneficial" or "are very helpful."
Dictionary
are extremely useful
adverb
To an extreme degree
synonyms
Exact(59)
Business studies and economics are good, and maths, science and technology are extremely useful.
But they are extremely useful for a wide variety of companies in marketing their wares.
But if the goal is to create the George Lucas and Steve Jobs of the future, then laptops are extremely useful".
Hourly automated observations like this are extremely useful to forecasters like Mr. Kok, but they are even better when they are "ground-truthed" by a person.
Such queries are extremely useful for many visualization tools.
The convexity and monotonicity properties of are extremely useful.
They are extremely useful in heart attack therapy.
However, their excellent tribological properties are extremely useful.
Backdoors are extremely useful in a heavily connected environment dominated by global networks.
Episodic Utilities, such as OpenTable, Uber and Hipmunk, are extremely useful in certain situations.
"Common standards are extremely useful as they speed up the pace at which businesses can connect.
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