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2. Duolingo English Test - Wikipedia

   en.wikipedia.org/wiki/Duolingo_English_Test

   The Duolingo English Test (DET) is a standardized test of the English language designed to be internet-based rather than paper-based. DET is an adaptive test that uses an algorithm to adapt the difficulty of the test to the test-taker. [1][2][3] It was developed by Duolingo in 2014 as Test Center [4] and grew in popularity and acceptance at universities during the COVID-19 pandemic. [5][6][7 ...

3. Duolingo - Wikipedia

   en.wikipedia.org/wiki/Duolingo

   Duolingo, Inc., [b] is an American educational technology company that produces learning apps and provides language certification.Duolingo offers courses on music, [5] math, [6] and 43 languages, [7] ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo. [8]

4. Luis von Ahn - Wikipedia

   en.wikipedia.org/wiki/Luis_von_Ahn

   In November 2011, a private beta test of Duolingo was launched and the app was released to the public in June 2012. [25][26] As of May 2020, Duolingo was valued at $1.5 billion. [27] In a talk with NPR, von Ahn shared that Duolingo saw a spike in users during the COVID-19 pandemic.

5. English grammar - Wikipedia

   en.wikipedia.org/wiki/English_grammar

   English grammar English grammar is the set of structural rules of the English language. This includes the structure of words, phrases, clauses, sentences, and whole texts.

6. Low Cost vs. Free Online Therapy Options in 2024 - Healthline

   www.healthline.com/.../online-therapist-for-free

   Online therapy is usually not free, but there may be free resources or online therapy options that cost less than in-person therapy. Here, we've rounded up the best low cost and free online ...

7. Language education - Wikipedia

   en.wikipedia.org/wiki/Language_education

   Language education – the process and practice of teaching a second or foreign language – is primarily a branch of applied linguistics, but can be an interdisciplinary field. [1][2] There are four main learning categories for language education: communicative competencies, proficiencies, cross-cultural experiences, and multiple literacies. [3]