Using the Present Perfect

present-perfectWe use the Present Perfect to express an action that has happened at an unspecified or unknown time before now.  You can use yet, already, ever, or before with the Present Perfect because it is not a specific time.  You cannot use words like yesterday, last week, or when I was ten years old because this indicates a specific time in the past.

www.englishpage.com/verbpage/presentperfect.html

http://esl.about.com/library/quiz/blpastorperfect1.htm

http://esl.about.com/library/grammar/blpresperfect.htm

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