have been machining

• 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 machine.
  machine

  noun

  an apparatus consisting of interrelated parts with separate functions, used in the performance of some kind of work.

Related Words

• apparatus
• appliance
• automobile
• engine
• gadget
• instrument
• motor
• tool
• vehicle