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"What methods" is correct and can be used in written English.
You can use it when asking a question about the methods that are being used to complete something. For example: "What methods are being used to complete this project?".
Exact(60)
What methods were used?
What methods of transportation have been affected by the strikes?
What methods were used to express these stories?
What methods did protesters employ against the logging industry?
What methods did the FBI use to infiltrate or investigate the subject(s)?
What methods did scientists at the University of Bristol use to analyze mummies' tissue samples?
What methods were used to study the texts without damaging them?
What methods do you use to create your projections and rankings?
What methods, equipment, monitors, technology or Internet-enabled software have made agriculture or animal breeding more productive or efficient?
What methods are used to administer the training?
What methods will we use to assess risks?
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