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Which one is correct? I have sent it or I have send it.
Sent is the part participle of "send" and therefore used in the present perfect.
Comments 
I am wondering if you have sent it by post or e-mail.
Anonymous Which one is correct? I have sent it or I have send it.
"/i have sent it /" is correct because with perfect tense we use third form of verb/past participle
Anonymous"/i have sent it /" is correct because with perfect tense we use third form of verb/past participle
Barbara did say that - five years ago.