had been confirming

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of confirm.
  confirm

  verb (used with object)

  to establish the truth, accuracy, validity, or genuineness of; corroborate; verify.

Related Words

• affirm
• approve
• back
• certify
• corroborate
• endorse
• establish
• explain
• sign
• substantiate
• support
• uphold
• verify