Present perfect ( I had done )

   Form
Positive
Subject + have/has + verb3 + conplement.
Negative
Subject + have/has + not + verb3 + complement.
  Question
Have/has + subject + verb3 + complenent.
  

   Using
1
A / When we use the present perfect there is always a connetion with now. The action in the past has a result now.
    Example;
  Tom is looking for his key. He can't find it. "He has lost his key".
' He has lost his key ' = He lost it and hasn't got it.
  Have/has + lost is the present perfect.
B / we often use the present perfect to give new information or to annouce a recent happening;
     Example
Ow! I've cut my finger. (Give information)
 
  2
  Present perfect with :( just, ready, yet )
    
   Just = ' a short time ago ';
Ex ; Hello! Have you just arrrived ?

   Already = something happened sooner than expected.
Ex ; ' What time is Mark leaving? '   ' He has already gone '
 
    Note
  The diference between gone ( to ) and been ( to ):
     Ex;
1 / Jim is away on holiday. He has gone to Thialand. (= he is there now or on his way there.)
2 / Jane is back home from holiday now. She has been to Cambodia. = she has now come back from Cambodia.

Signal Words of Present Perfectalready,

ever, just, never, not yet, so far, till now, up to now,,,,,,,,,,,,,