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May i ask a silly question?

What is the difference of Present Perfect Tense and Past Perfect tense?
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You can ask questions, but you can't ask them twice.
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An action you've just completed a moment ago, use ' present perfect tense ' eg I've just asked a question at EnglishForward.comEmotion: smile

Two actions took place in the past, one after the other, we use ' past perfect ' for the previous action.

eg. While I tried to ask this question, someone had already done it.