has been untying

• 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 untie (3rd person singular).
  untie

  verb (used with object)

  to loose or unfasten (anything tied); let or set loose by undoing a knot.

Related Words

• disentangle
• loosen
• untangle