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The phrase "have studied that" is correct and can be used in written English.
It is commonly used in sentences to indicate that the speaker has gained knowledge or understanding about a particular topic or subject in the past. Example: "I have studied that subject extensively and can confidently say that it is not as difficult as it seems."
Exact(20)
If not for the distractions of all the hairdo paintings around it, I might have studied that bag for quite a while.
For Huffard, this is a subject ripe for research: "People have studied that topic extensively in arthropods, especially arachnids, but not in rigorous studies using cephalopods".
Previous researchers have studied that optic fiber and capacitance drop sensor fusion technology can indirectly gain drop's form and the volume.
Pawelek et al. [7] have studied that models of HIV-1 infection incorporating intracellular delays are more accurate representations of the biology, and that they can change the estimated values of the kinetic parameters when compared to models without delays.
Researchers for the foundation have studied that inaugural group of three- and four-year olds into their 40s.
I was steered into English, though I'm absolutely happy to have studied that.
Similar(40)
Google, he said, has studied that history.
Ms. Daykin had studied that era extensively in preparing "Encores!
Chinese scholars had studied that puzzle from dozens of angles, but Xi wanted more.
I hope that President Obama has studied that historical lesson as well as the lessons from Vietnam.
"It's just something I sort of fell into," Higgins said, opening his laptop to show me videos that he had studied that morning.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com