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I certainly know vs I, myself know

I certainly know vs I, myself know which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I certainly know is the most popular phrase on the web.

I, myself know

17,460 results on the web

I certainly know

133,300 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • I myself know nothing, except just a little, enough to extract an argument from another man who is wise and to receive it fairly. Theaetetus, 161b. μοι νυνὶ ...
  • I Myself Know (HD). kaktus reggae. SubscribeSubscribedUnsubscribe 11,25611K. Loading... Loading... Working... Add to ...
  • Dec 14, 2009 ... Sizzla
  • I Myself Know BIG TUNE! Zionradio. SubscribeSubscribedUnsubscribe 367367. Loading... Loading... Working... Add to ...
  • Cause I myself know, that no man is an island, no man stand alone. Cause I myself know, without the Conquering Lion I would never endure. When I heard them ...
  • Oct 30, 2011 ... Sizzla
  • I certainly know a few parents who need to see these! gasp emoticon. 5 Ways You're Ruining Your Child's Life Without Even Realizing It. I'm SO Tired Of Seeing ...
  • Feb 8, 2016 ... I certainly know I'm better because of seeing her all the time. #lifeisprecious https: //twitter.com/SeattleSusieQ/status/696955951211917313 …
  • We've never met, but I certainly know of him. Usage notes: also used in the spoken phrase not that I know of (I do not know): “Is he home yet?†“Not that ...
  • Certainly, I believe in that. Don't know how I'm gonna get there, but I certainly know I see the end. That's good news, not CNN... Lyric Meaning. Jet believes that if ...

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