The Present Perfect Simple Tense
We use the present perfect simple tense when we want to talk about an event in the past, but we do not know the time it happened. For example, lets say you want to talk about the old car you saw a long time ago, but you forget what year, you would say:
They have seen an old car.
She has seen a really old car.
We know they and she have seen old cars, but we do not know when. Lets say you have done something over time, for example from 2010 to 2012, we can say:
From 2010 until 2012, I`ve finished my studies, I have worked in a shop, and have ran a marathon.
Do you think it sounds like experiences? This is also the method for talking about life experiences.
People usually have done many things in their lifetime, for example:
I have travelled around the world, but I haven`t flown an aeroplane.
As we can see, one is has done (travelled around the world) and the other has not done (flown an aeroplane)
If you want to compare something with the past and present, for example:
Apples have become more expensive
Before they were cheap, now they are expensive.
It is always the case to use has or have + the past particle. What is the past particle?
Work = worked
walk = walked
run = ran
We also use the present perfect simple alot with the words for and since.
We use for with a length of time:
She's worked here for ten years.
We use since with a point of time to describe when the period of time began:
They've lived here since 2001.
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