Present Perfect Simple Vs. Past perfect

Both present perfect and past perfect talk about something that happened before a point in time (reference point).

In the present perfect, our reference point is the present.

In the past perfect, our reference point is in the past.

	Present perfect	Past perfect
Usage	An action that started in the past and continues to the present. e.g. I have lived in this city for six months. An action that happened before now (unspecified time) I have been to Japan twice.	·         An action that happened before a time in the past. e.g. When I arrived at the office this morning, I discovered that I had left my computer on the night before.
Structure	HAVE / HAS + past participle	HAD + past participle
Examples	My mother has just gone to the store. Janet has lived abroad for five years. I haven’t seen the new movie yet. Have you finished your homework?	Situation: I went to Japan in 1988 and 1991. I turned 10 years old in 1994. Past perfect sentence: I had been to Japan twice by the time I was 10 years old. Situation: My husband ate breakfast at 6:00 AM I woke up at 7:00 AM Past perfect sentence: When I woke up this morning, my husband had already eaten breakfast.
Short form	It’s very common to use the contractions ‘ve and ‘s in the present perfect: I’ve been to Japan three times. My mother’s just gone to the store. Janet’s lived abroad for five years.	It’s common to use the contraction ‘d in the past perfect: ·         I’d traveled to five different countries by the time I was 20 years old.

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