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please give me some examples for the use of these two tenses
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This was sort of covered in a thread yesterday, but here's a link directly to the kind of information you're looking for.

[url="http://owl.english.purdue.edu/handouts/esl/esltensverb.html#presperf "][/url]

I hope that helps you out! I think it does a better job of giving examples than I would.

-Haoqide
The answer below is swiped straight out of "grammar monster". (The cut and paste has killed the formatting, but the detail is still there.

Hope this helps.

Present Progressive Tense
Verbs describing actions in the present are said to be in the present tense. The present progressive tense is used for an on-going action in the present.

Caroline is looking for the latest brochure.
Dan and Billy are fishing off the pier.

The present progressive tense is one for four present tenses. They are:
The 4 Present Tenses Example
simple present tense - I go
present progressive tense - I am going
present perfect tense - I have gone
present perfect progressive tense - I have been going

Present Perfect Tense
Verbs describing actions in the present are said to be in the present tense. The present perfect tense is used for an action that began in the past and continues into the present.

The board has decided not to uphold the appeal.
I have taken the wrong path again.
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What type of sentense is a Present perfect sentense?
I have been working on this project for three hours.
Hi,

Either is OK.

I have been working on this project for three hours. 'Continuous' stresses the duration. Implies that you are still working on it at the time of speaking.

I have worked on this project for three hours. Doesn't do the above to the same extent.

Best wishes, Clive
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CliveI have been working on this project for three hours. 'Continuous' stresses the duration. Implies that you are still working on it at the time of speaking.I have worked on this project for three hours. Doesn't do the above to the same extent.
What does the red sentence mean?
Hi again,

I have been working on this project for three hours. 'Continuous' stresses the duration. Implies that you are still working on it at the time of speaking.

I have worked on this project for three hours. Doesn't stress the duration to the same extent. Doesn't imply to the same extent that you are still working on it at the time of speaking.

Best wishes, Clive
I have worked on this project for three hours(this means work has totaly finished
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