past perfect progressive
Of a bird, having yellow plumage covering the top part of the head.
The act of advancing; promotion to a higher place or dignity / The state of being advanced / How advanced something is / An advance of money or value; payment in advance.
past perfect continuous
(computing) A test where data is transmitted from one system to another system and back again.
教師は、過去完了進行形が他の過去の出来事の前に続いていた動作を表すと説明した。
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