"I had done" vs. "I have already done"
When I have completed something, I'm used to say: "I have already done it". However, instead of using "have already", maybe I could just say "I had done" ?

Question

"I had done" vs. "I have already done"
When I have completed  something, I'm used to say: "I have already done it". However, instead of using "have already", maybe I could just say "I had done" ?

Answer

No; "had done" is past perfect and a completely different timeframe.