BBC

The past continuous or past perfect continuous tense?

What's the difference between 'fill up', 'fill out' and 'fill in'?

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BBC

小测验 — 过去完成时和过去完成进行时

“过去完成进行时 past perfect continuous” 表示在过去的一个时间点之前持续发生的动作或事情，基本结构是 “had been + doing”。 比如，下面这句话的意思是：在这部电视剧被 “砍” 之前，我已经连续看了几周了。 I had been watching this TV series for weeks before it got cancelled.