Is it did'nt or didn't
It is 'didn't'
wiki.answers.com/Q/Is_it_did'nt_or_didn't

NO I DIDN'T
Yes.
wiki.answers.com/Q/NO_I_DIDN'T

By didn't of
Help us answer this question: By didn't of
wiki.answers.com/Q/By_didn't_of

What did he do and what did he didn't do
Help us answer this question: What did he do and what did he didn't do
wiki.answers.com/Q/What_did_he_do_and_what_did_he_didn't_do

I didn't. I did.
Help us answer this question: I didn't. I did.
wiki.answers.com/Q/I_didn't._I_did.

What I Didn't Do
What I Didn't Do "What I Didn't Do" Single  by Steve Wariner from the album One Good Night
www.answers.com/topic/what-i-didn-t-do-1

Didn't I (Blow Your Mind This Time)
Didn't I (Blow Your Mind This Time) This article does not cite any references or sources
www.answers.com/topic/didn-t-i-blow-your-mind-this-time

If I Didn't Have You (2007 Album by Richie Ren)
If I Didn't Have You Artist: Richie Ren Release Date: 2007 Genre: Rock Previous
www.answers.com/topic/if-i-didn-t-have-you-2007-album-by-richie-ren

I Didn't Get Where I Am (2003 Album by Chris Difford)
I Didn't Get Where I Am Artist: Chris Difford Rating: Release Date: February 18, 2003 Total
www.answers.com/topic/i-didn-t-get-where-i-am

No You Didn't (2009 Album by American Yard)
No You Didn't Artist: American Yard Release Date: June 16, 2009 Type: Single Genre: Rap
www.answers.com/topic/no-you-didn-t