keele

In a sentence

• Ma õpin praegu uut keelt.

  I am currently learning a new language.

  Here, 'keelt' is in the singular partitive case, referring to learning a language as a general activity.

• Keeled on uksed teiste rahvuste mõistmiseks.

  Languages are doors to understanding other cultures.

  Here, 'keeled' is in the plural nominative case, denoting multiple languages in a broad sense.

• Mulle meeldib see keel, mida sa räägid.

  I like the language you speak.

  Here, 'keel' is in the singular nominative case, expressing interest in a specific language.