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Discover LudwigThe phrase "know this firsthand" is correct and usable in written English
It can be used when you want to express that you have direct personal experience or knowledge of something.
Example: "Having traveled extensively in the region, I know this firsthand: the culture is rich and diverse."
Alternatives: "have direct experience" or "understand from personal experience."
Exact(24)
I know this firsthand.
(As a sophomore in high school, I know this firsthand from my English class).
I know this firsthand, having worked as a creative director in the industry for 15 years.
"I know this firsthand, because the community groups in his district stopped coming to me," Mr. Trotter said.
I know this firsthand, as I previously managed two small Detroit-based seed funds.
Unfortunately, many of you will never know this firsthand because you're never going to buy this device.
Similar(35)
Tomoko Nakamura knows this firsthand.
He knows this firsthand.
Jo Hee Sisco, 38, knows this firsthand.
One 36-year-old woman knows this firsthand.
Gregory Murphy, 43, a longtime resident of Camp La Guardia, knows this firsthand.
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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