Past Perfect Continuous
1Công thức
had + been + verb-ing; negative: had not been + verb-ing; question: Had + subject + been + verb-ing?2Giải thích
Thì quá khứ hoàn thành tiếp diễn nhấn mạnh quá trình kéo dài đến một thời điểm trong quá khứ, hoặc hành động vừa dừng lại và giải thích cho tình huống ở quá khứ. Công thức: had been + V-ing.
Emphasises the duration of an activity up to a moment in the past, or an activity that had just stopped and explains a past situation.
Dấu hiệu: forsinceall dayhow longby the time
3Khi nào dùng
- Activities continuing up to a past moment
- Activities that had just stopped, explaining a past result
4Quy tắc cần nhớ
- Often used with for and since
- Stative verbs are not used in this form
- Use the simple form when the number of completed actions matters
5Ví dụ
The ground was wet because it had been raining all night.
She had been studying for hours when the power went off.
We had been waiting for an hour before the doctor arrived.
6Lỗi thường gặp
- He was tired because he was working all night. (earlier cause: had been working)
- They had been knowing each other for years. (stative: had known)