Work at LLF displays a great diversity with respect to the languages under investigation:
- Afroasiatic : Semitic (Classical Arabic, Egyptian Arabic, Moroccan Arabic, Mehri, Chaha, Tigre, Tigrinya, Hebrew, Maltese), Berber, Egyptian (Ancient, Coptic), Kuchitic (Somali), Chadic (Hausa)
- Altaic: Korean, Japanese, Turkic
- Australian : Dalabon, Enindhilyakwa, Jaminjung, Kuuk Thaayorre, Mparntwe Arrernte, Murrinh-Patha, Ngarinyin, Nyamal, Panyjima
- Austro-asiatic : Khmer, Vietnamese
- Austronesian : Amis, Taroko, Malagasy
- Celtic : Welsh, Breton
- Creoles : French-based (Haitian, Mauritian, Reunion), Portuguese-based (Kriyol de Guinée Bissau, Indo-Portuguese), Arabic (Nubi)
- Indoeuropean : Germanic (German, Bavarian, Dutch, Yiddish, English, Norwegian), Romance (French, Spanish, Gallo-Romance, Italian, Latin, Occitan, Romanian, Iberian Portuguese, Brazilian Portuguese), Indo-Iranian (Armenian, Kurdish, Persian, Nepali), Slavic (Bulgarian, Russian, Czech), Baltic (Lithuanian), Modern Greek
- Finno-Ugrian : Finnish, Hungarian, Nenets, Estonian
- Otomanguan : Mazatec
- Niger-Congo : Bamun, fongbe, kiswahili, shingazidja, simakonde
- Sinitic : Mandarin Chinese, Cantonese dialects, Minnan (Taiwan)
- South-Caucasian : Laz
- Tupi : Karitiana
- Sign language: Italian Sign Language, French sign language