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had been forming
  • past perfect progressive of form.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"For one reason or another, we don't see evidence of grounded ridges where they had been forming, and that's the outcome you would expect if the ice is getting thinner."

From Science Daily • Mar. 27, 2026

He knew exactly what he wanted to create, as the idea had been forming slowly, ever since his ex-wife and mother of his children died in 2008.

From BBC • Feb. 6, 2026

The idea for this book had been forming since maybe 2015, and it was during this time period I finally realized what I wanted it to be.

From Salon • Sep. 30, 2024

Cracks had been forming since the time around that “Conan” set and broke wider after her first Netflix special, “Quarter-Life Crisis,” which came out in March 2020 just as the pandemic hit.

From Los Angeles Times • Mar. 4, 2022

He stared down at his project, but when he spoke, he blurted out an idea that had been forming ever since Calypso made his new clothes.

From "The House of Hades" by Rick Riordan