had + been + 動詞 + ing 係咩tense

past perfect continuous tense

動詞的過去完成進行時態的形態是：

had been + 動詞的現在分詞
動詞的過去完成進行時態表示：

過去某一時間以前已經開始而到那時還正在進行的動作或狀態

例如：

They had been playing ball for an hour when you reached
the playground.
I had been doing my homework for three hours when he
visited me yesterday.

過去完成進行時：
「I had been listening.」表達一個動作在過去某一時刻發生，並一直延續到過去另一個時刻。

Past perfect continuos tense

動詞的過去完成進行時態表示：

過去某一時間以前已經開始而到那時還正在進行的動作或狀態.

past perfect continous tense