continuous tense vs past continuous

continuous tense

noun
  • A verb tense expressing ongoing action; in English, any of the tenses formed with the present participle, namely present continuous ("I am dreaming"), past continuous ("I was dreaming"), present perfect continuous ("I have been dreaming"), past perfect continuous ("I had been dreaming"), future continuous ("I will be dreaming") or future perfect continuous ("I will have been dreaming"). 

past continuous

noun
  • A tense used to describe actions and states continued in the past. 

How often have the words continuous tense and past continuous occurred in a corpus of books? (source: Google Ngram Viewer )