research
noun
diligent and systematic inquiry or investigation into a subject in order to discover or revise facts, theories, applications, etc..
had researched
-
past perfectof research.past perfect
Used to express a completed action that took place before another specific past action occurred.
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.
The Chinese had researched how urgently Canada needed non-American buyers for its canola seed, and easily agreed to lower agricultural tariffs in return for Canada welcoming 49,000 Chinese electric cars.
From The Wall Street Journal ● Jul. 8, 2026
"The linen backing is weakened by age, and the wool embroidery threads are vulnerable to stress," he said, adding that he had researched the process.
From BBC ● Jan. 14, 2026
He said he also asked if she had researched him and his cafe and what they were trying to do.
From Los Angeles Times ● Aug. 15, 2025
Before he got a HeartMate 3 implanted in January 2022, Sid Covington, of Austin, Texas, said he had researched the device during years of medication therapy and cardiac rehabilitation to treat his congestive heart failure.
From Seattle Times ● Jan. 2, 2024
We had met in the United States as he had researched the Nation of Islam for his book, Black Nationalism.
From "The Autobiography of Malcolm X" by Alex Malcolm X;Hailey
