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Transcript of Present perfect
You CANNOT use the Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc.
We use the Present Perfect to say that an action happened at an unspecified time before now.
has/have + past participle
The Present Perfect is NOT used to describe a specific event.
Change over time
Used to talk about change that has happened over a period of time.
An uncompleted action you are expecting
Used to say that an action which we expected has not happened. Using the Present Perfect suggests that we are still waiting for the action to happen.
Multiple actions at different times
Used to talk about several different actions which have occurred in the past at different times. Present Perfect suggests the process is not complete and more actions are possible.
The exact time is not important.
We CAN use the Present Perfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, etc.
You have seen that movie many times.
Have you seen that movie many times?
You have not seen that movie many times.
I have been to France.
This sentence means that you have had the experience of being in France. Maybe you have been there once, or several times.
I think I have seen that movie before.
He has never traveled by train.
You have grown since the last time I saw you.
The government has become more interested in arts education.
My English has really improved since I moved to Australia.
James has not finished his homework yet.
Bill has still not arrived.
The rain hasn't stopped.
The army has attacked that city five times.
I have had four quizzes and five tests so far this semester.
We have had many major problems while working on this project.
Used to list the accomplishments of individuals and humanity. You cannot mention a specific time.
Man has walked on the Moon.
Our son has learned how to read.
Scientists have split the atom.