Unit 02-Past perfect vs. Past perfect continuous-structure 6

Past perfect vs. Past perfect continuous : 1 Past perfect vs. Past perfect continuous Past perfect is parallel to present perfect; the manner of action is the same, but the time reference is different. PAST NOW Have done PAST NOW Had done

Compare and contrast : 2 Compare and contrast Who is that woman? I have never seen her before. The house is dirty. They haven’t cleaned it for weeks. I didn’t know who she was. I had never seen her before. The house was dirty. They hadn’t cleaned it for weeks.

Present perfect continuous vs. past perfect continuous : 3 Present perfect continuous vs. past perfect continuous Past perfect continuous is parallel to present perfect continuous; the manner of action is the same, but the time reference is different.

Slide 4 : 4 Present perfect continuous Past perfect continuous PAST NOW Have been -ing Past Now Had been -ing

Slide 5 : 5 I’ve been waiting for 20 minutes. (before now) At last the bus came. I’d been waiting for 20 minutes. (before the bus came)

Slide 6 : 6 Perfect tense shows result. Perfect continuous shows process. I had been looking for my keys for hours before I finally found them. When I reached the airport, the plane had taken off.