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Discover LudwigThe phrase "are effective" is correct and usable in written English.
You can use it to describe the efficacy or success of a method, strategy, or action in achieving a desired outcome.
Example: "The new marketing strategies are effective in increasing our customer engagement."
Alternatives: "prove to be effective" or "are successful".
Dictionary
are effective
adjective
Having the power to produce a required effect or effects.
Exact(60)
They are effective.
"These are effective immediately.
The moves are effective immediately.
Several treatments are effective.
Alcohol awareness programs are effective.
Both are effective and economical.
Both promotions are effective immediately.
The appointments are effective Feb. 22.
Do you think they are effective?
Mr Solana's watchwords are "effective multilateralism".
There are effective alternatives to physical punishment.
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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