As we reviewed it this morning and added more information here is a page to remind you how to form the present perfect and when to use it.
PRESENT PERFECT: USE
1) Result of an action in the past that is important in the present
I have cleaned my room.
2) Recently completed action
He has just played handball.
3) State beginning in the past and still continuing
We have lived in Canada since 1986.
With this words
just, yet, never, already, ever, so far, up to now, recently, since, for
FORM
have/has + past participle
Examples
Affirmative sentences:
I have cleaned my room. I've cleaned my room. | You have cleaned your room. You've cleaned your room. |
Negative sentences:
I have not cleaned my room. I've not cleaned my room. I haven't cleaned my room. | You have not cleaned your room. You've not cleaned your room. You haven't cleaned your room. |
Questions:
Have I cleaned my room? | Have you cleaned your room? |
Here are some new exercises on since and for.
http://www.englishexercises.org/makeagame/viewgame.asp?id=1394
And here other exercises to practice this structure.
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
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