will have been prolonging

• future perfect progressive

  future perfect progressive

  Used to describe a continuous action that will progress up until a designated point of completion in the future.

  of prolong.
  prolong

  verb (used with object)

  to lengthen out in time; extend the duration of; cause to continue longer.

Related Words

• continue
• delay
• drag out
• lengthen
• perpetuate
• protract
• stall