Verb Tenses

Present perfect - USE 1

Unspecified Time Before Now

FORM
[has/have + past participle]

TOPIC 1 Experience
TOPIC 2 Change Over Time
TOPIC 3 Accomplishments
TOPIC 4 An Uncompleted Action You Are Expecting
TOPIC 5 Multiple Actions at Different Times

TOPIC 1 Experience

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 had the experience of being in France. Maybe you have been there 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.
A: Have you ever met him?
B: No, I have not met him.

TOPIC 2 Change Over Time

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

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

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 to happen.

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.

TOPIC 5 Multiple Actions at Different Times

TOPIC 5 Multiple Actions at Different Times
We also use the Present Perfect 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.

Examples:

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.
She has talked to several specialists about her problem, but nobody knows why she is sick.

Present Perfect - use 2

USE 2 Duration From the Past Until Now (Non-Continuous Verbs)

With Non-Continuous Verbs and non-continuous uses of Mixed Verbs, we use the Present Perfect to show that something started in the past and has continued up until now. "For five minutes," "for two weeks," and "since Tuesday" are all durations which can be used with the Present Perfect.

Examples:

I have had a cold for two weeks.
She has been in England for six months.
Mary has loved chocolate since she was a little girl.

Although the above use of Present Perfect is normally limited to Non-Continuous Verbs and non-continuous uses of Mixed Verbs, the words "live," "work," "teach," and "study" are sometimes used in this way even though they are NOT Non-Continuous Verbs.