1. The past participle often ends in – ed ( finished / decided etc. ) but many important verbs are irregular ( lost /done / been / written etc. ).

2. When we use the present perfect there is always a connection with now. The action in the past has a result now. 

' Where's your key? '      " I don't know. I've lost it." (I haven't got it now)

3. We often use the present perfect to give new information or to announce a recent happening.

 Oh! I've cut my finger. 

4. You can use present perfect with just, already and yet. 

Just = a short time ago.  

'Would you like some thing to eat?'    'No, thanks. I've just had lunch.' 

Already = to say that some thing happened sooner than expect. 

'Don't forget to post the letter, will you?'    'I've already posted it' 

 Yet = ' until now ' and shows that the speaker is expecting something to happen. Use yet only in questions and negative sentences. 

Has it stopped raining yet?

I've written the letters but I haven't posted it yet. 

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Preparation by School Arabia	Edit By www.schoolarabia.net
Updated: November 2008