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Guest:
please give me some examples for the use of these two tenses
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
Full Member307
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.
New Member13
Anonymous:
What type of sentense is a Present perfect sentense?
Anonymous:
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
Veteran Member67,724
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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?
Contributing Member1,620
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
Moderator: A super-user who takes care of the forums. You have the ability to message a moderator privately should you wish. These users have a range of elevated privileges including the deletion, editing and movement of posts when needed.Teachers: Users in this role are certified teachers. This may include DELTA, CELTA, TESOL, TEFL qualified professionals. Email a scan of your qualification to an admin, if you wish to be considered.
Anonymous:
I have worked on this project for three hours(this means work has totaly finished
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