Avançado - 2. Present Perfect (Part 1 of 2 - Exercises with part 2)

FORM Present Perfect

[HAS / HAVE] + [past participle]
EXAMPLES:
• I have seen that movie many times.
• I have never seen that movie.

NOTE: When you are using a verb tense with more than one part such as Present Perfect (have seen), adverbs usually come between the first part and the second part (have never seen).

USE 1 Unspecified Time Before Now

We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT use the Present Perfect with time expressions such as "yesterday," "one year ago," "last week," "when I was a chlid," "when I lived in Japan," "at that moment," "that day" or "one day." We CAN use the Present Perfect with expressions like "ever," "never," "once," "many times," "several times," "before," "so far," "already" and "yet."
EXAMPLES:
• I have seen that movie twenty times.
• I think I have met him once before.
• There have been many earthquakes in California.
• Has there ever been a war in the United States?
• Yes, there has been a war in the United States.
• People have traveled to the moon.

IMPORTANT How do you actually use the Present Perfect?
The concept of "unspecified time" can be very confusing to English learners. It is best to associate Present Perfect with the following topics:

TOPIC 1 Experience
You can use the Present Perfect to describe your experience. It is like saying, "I have the experience of..." You can also use this tense to say that you have never had a certain experience. The Present Perfect is NOT used to describe a specific event.
EXAMPLES:
• I have been to France.
• (This sentence means that you have the experience of being to France. Maybe you have been once, or several times.)
• I have been to France three times. (You can add the number of times at the end of the sentence.)
• I have never been to France.(This sentence means that you have not had the experience of going to France.)
• I think I have seen that movie before.
• He has never traveled by train.
• Joan has studied two foreign languages.
• Have you ever met him?
• No, I have not met him.

TOPIC 2 Change Over Time
We often use the Present Perfect to talk about change that has happened over a period of time.
EXAMPLES:
• You have grown since the last time I saw you.
• The government has become more interested in arts education.
• Japanese has become one of the most popular courses at the university since the Asian studies program was established.
• My English has really improved since I moved to Australia.

TOPIC 3 Accomplishments
We often use the Present Perfect to list the accomplishments of individuals and humanity. You cannot mention a specific time.
EXAMPLES:
• Man has walked on the moon.
• Our son has learned how to read.
• Doctors have cured many deadly diseases.
• Scientists have split the atom.

TOPIC 4 An Uncompleted Action You Are Expecting
We often use the Present Perfect to say that an action which we expected has not happened. Using the Present Perfect suggests that we are still waiting for the action.
EXAMPLES:
• James has not finished his homework yet.
• Susan hasn't mastered Japanese, but she can communicate.
• Bill has still not arrived.
• The rain hasn't stopped.


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