英日字典: past_progressive_tense
    The past_progressive_tense has 1 Senses.
-  past progressive tense, past progressive
 -  過去進行形
 - a progressive tense used to describe on-going action in the past; "`I had been running' is an example of the past progressive"
 - 進行時制で、過去に動作が進行中だったことを示すときに使われる
 
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