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hi ,
i have some sentence i hope to find explications answar me quation "why we use the presnt perfect or present perfect continuous ?? "

1. Tom's has got an important job to finish by the end of the month. He (stay) at work until after 10 o'clock three days this week already.
2. Marie has been in Stockholm for a few weeks now. She (stay) with her friend Inga while she's there.
3. I (see) a physiotherapist for a couple of years- ever since I broke my wrist.
4. We reached the top of hill as the sun began to disappear beneath the horizon. It was one of the most spectacular sunsets I (see) in my whole life.
5. A) where have you been all day? B) I (finish) my homework.
6. A) you are looking pleased with yourself. B) Yes, (finish) my last exam and I'm going on holiday tomorrow.
7. A) Do you fancy a game of squash this week end?B) No thanks. I (play) a couple of times before, but I just can't get the hang of it.
8. A) Paul! Look at your clothes! B) Sorry Mum. I (play) football in the park and it was a bit muddy.
and thanks befor
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Is the action something that extends continuously, habitually, or regularly from the past to the present? That is, at any point in time between the start of the action and now, if you looked at what was happening, would this action be happening? If so, you need the continuous tense. Otherwise, don't use the continuous tense.
Look at the second example.
Marie has been in Stockholm for a few weeks now. She ..... with her friend Inga while she's there.

Was she staying with Inga 13 days ago? Yes.
Was she staying with Inga 12 days ago? Yes.
Was she staying with Inga ...
Was she staying with Inga two days ago? Yes.
Was she staying with Inga yesterday? Yes.
It seems that the action of "staying with Inga" has been "happening" continuously. So she has been staying with Inga while she's there.
____

Now take a look at Example 7.
I ... a couple of times before, but I just can't get the hang of it.
In my whole life I only played squash a couple of times, so that doesn't seem like a lot, does it?
Was I playing squash yesterday? Was I playing squash the day before? What about the day before that? What about the day before that? You would have to answer "Probably not" to each of these questions.

Obviously, I do not play squash regularly. I do not play habitually. The continuous tense does not apply. So I have played a couple of times before.
In general, you can't use the present perfect continuous when you have done something a certain number of times.
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Now maybe you can try them all yourself.
CJ
Comments  
Should I tell you the answers or help you find them yourself? We use the present perfect continuous when we want to emphasize that the action was continuous. This is hard to see sometimes.

Here is a good example of the difference.

I have been painting the wall. (This person may have paint on his clothes and is probably still not finished painting the wall. The focus here is on the action of painting)

I have painted the wall. (The focus is on the result. The wall was painted and this action is finished)

1. Both are ok. I would use the continuous because I would want to emphasize the duration of this action.
2. Continuous. Because it is still happening now and is a continuous action

Check to see if the action or the result is more important.

4. The "seeing" is not the most important. What you see is the most important, the sunset. So this one is not continuous.

Hope this helps.

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 CalifJim's reply was promoted to an answer.