The present perfect is used to talk about an action that started in the past and it continues to now. The sentences is formed with: sub + verb auxiliar (have) + verb (past participle)
Positive: I have seen that film
Negative: I haven't seen that film
Interrogative: Have you seen that film?
To complement the sentence we used the words: just, still, already and yet.
Webpage's:
http://www.nb2.go.th/~praphas/english/grammarcon/37.gif
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