will have been mastering

• 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 master.
  master

  noun

  a person with the ability or power to use, control, or dispose of something.

Related Words

• administrator
• boss
• commander
• director
• guru
• instructor
• judge
• manager
• owner
• ruler
• teacher