I haven't saw you in first five since your childhood. vs I haven't seen you in first five since your childhood.

Some examples from the web:

• Bill, I've put you in first slip.
• Polls have you in first place.
• I'm sending you in first, then Taggert.
• Look, I missed you in first period.
• I saw every one of these patients myself every two weeks for the first five years.
• She then turned to the black man sitting next to the South African lady and said, 'Sir, if you would like to get your things, I have a seat ready for you in first class up at the front.'
• I also put you in first grade when you were five, and I never told you.
• Are you in first year medical school? No.
• I have an eyewitness who saw you tampering with the second shipment.
• And I have witnesses that saw you harassing me at the race.
• I have been ever since I saw you doing that ridiculous Molly Ringwald dance.
• I have thought of nothing but you even since I first saw you on Lemnos.
• And I have an eyewitness that saw you toss two coffee cups into the Dumpster that night.
• I haven't stopped thinking about you... since that first time I saw you getting out of the elevator.
• I have an eyewitness, Diane, that saw you pass cigarettes to Scott Ross.
• My father said he saw you and Rick getting all cozy in the cafeteria, so now I have to fake break up with him.
• I saw you guys. I have a bad habit of showing up at the wrong time.
• Ever since I saw you... I have gone mad after you.
• I have represented the Federation in first contact with 27 alien species.
• I'm feeling better, which in my world means I haven't committed a homicide since I last saw you.

Some examples from the web:

• I haven't seen you since the blackout.
• I haven't seen you since Georgetown.
• I haven't seen you here before.
• I haven't seen you touch either of them.
• But I haven't seen you in almost three weeks.
• I haven't seen you on the bins much.
• I haven't seen you like that since your 40th.
• I haven't seen you since your promotion, captain.
• I haven't seen you this upset since you almost forgot Ann's half-birthday.
• I haven't seen you in a while.
• I haven't seen you wear those hair pin...
• I haven't seen you, Miss Purpleplum.
• I haven't seen you do it yet.
• I haven't seen you in some time.
• Last couple days I haven't seen you.
• I haven't seen you in forever.
• Other than the party, I haven't seen you all week.
• I haven't seen you since the Madonna concert.
• I haven't seen you here since your father died.
• I haven't seen you in forever.