pastperfectcontinuous

We use the past perfect simple to refer to the completion of an activity and the past perfect continuous to focus on the activity and duration of the activity.

Past perfect continuous tense用法: 過去完成進行式用來描述過去某個時間之前一直持續發生的動作，強調動作的長時間和連續性。它通常由「had been + v-ing」構成。以下是 ...

2023年5月18日 — The formula for the past perfect continuous tense is had been + [present participle (root form of verb + -ing)]. Unlike ...

Past perfect continuous: form. We use had + been + the -ing form of the verb. ... See also: Verbs ...

過去完成進行時(The Past Perfect Progressive)強調動作從過去的過去開始一直延續到過去某個時間點。在過去某個時間點時，這個動作可能剛剛停止，也可能仍然在進行。

2017年7月17日 — 過去完成進行式Past Perfect Continuous · 1 肯定句： S + had + been + V-ing. · 2 否定句： S + had + not + been + V-ing. · 3 Yes/No 問句：Had + S + ...

過去完成進行式的作用過去完成進行式相應於現在完成進行式，但涉及比「過去」還要更早的時間。至於現在完成進行式，我們更強調過程。

過去完成進行式指的是在過去某事件前，更早的另一個動作已經持續進行了一段時間，且該動作在那時仍持續進行中。 I had been working nonstop for seven hours before ...

In this sentence, we see a little difference. The Children had been playing again. This is the past perfect, continuous tense had been playing.