has been infixing

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of infix (3rd person singular).
  infix

  noun

  a morpheme or an entire word that is inserted within the body of another word or element, as Latin m in accumbō “I lie down,” as compared with accubuī “I lay down.”

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