The phrase "extended essays" is correct and can be used in written English.
It refers to a type of academic writing where students are required to investigate a topic in-depth and present their findings in a structured and comprehensive essay. Example: The final year of university often involves completing extended essays on various subjects, giving students the opportunity to showcase their research abilities and critical thinking skills.
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"Because it turns out what I like to do best is write extended essays.
"Our assessment system must move away from pure examinations and towards a blended range of assessments like personal projects, extended essays, oral skills, as well as formal exams.
Over the past few months, she has broadcast extended essays on cultural touchstones like the Mamas and the Papas' hit "California Dreamin' " and a famous 1941 Rita Hayworth pinup as part of NPR's Present at the Creation series.
By using the word "postcards" for the title of this lively collection of a dozen reports written between the summers of 2006 and 2008 (11 of which were published in The Atlantic), he seems to be alerting readers to expect vignettes rather than extended essays.
His photographs, after all, are often meant to be seen as extended essays as much as as individual shots.
The extended essays by critics, including Stanley Crouch, Gerald Early, Gary Giddins and Dan Morgenstern, and the interview with Marsalis -- all advisers to the documentary -- read as though they belong in a different book altogether.
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When one of the major detection systems stopped working in December, a number of universities in the UK had to extend essay deadlines.
Now, an attribute must not be considered a substance, since it would be a mistake to equate action with what is acting, or extension with what is extended (New Essays A vi, 6, 210f).
And like the book it's basically an extended, ruminative essay, weaving together social history and personal reflection.
She currently has two extended, book-length essays out.
As The Nation's art critic, Mr. Danto wrote extended reviews and essays about prominent artists, past and present, with philosophical insight, professorial erudition and, almost always, sympathy and curiosity.
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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