had been certificating

• 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 certificate.
  certificate

  noun

  a document serving as evidence or as written testimony, as of status, qualifications, privileges, or the truth of something.

Related Words

• affidavit
• authentication
• authorization
• certification
• coupon
• credential
• deed
• diploma
• documentation
• guarantee
• license
• paper
• permit
• receipt
• ticket
• voucher
• warrant
• warranty