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I am sure vs I am certain

I am sure vs I am certain 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 am sure is the most popular phrase on the web.

I am certain

17,100,000 results on the web

I am sure

1195,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • I am certain your heart swells.
  • I am certain we cannot do business like before.
  • I am certain you'll want to do business with him.
  • I am certain you recognized me.
  • I am certain he was referring to you.
  • Sir, I am certain we are being watched.
  • However, I am certain that the victory will be mine.
  • I am certain that he went.
  • I am sure that something terrible will happen.
  • I am sure that it was a crime against an unknown God.
  • I am sure that some misfortune will happen.
  • I am sure honourable Members are not opposed to medical applications.
  • I am sure that I prefer my mother.
  • I am sure the honourable Member did not mean that.
  • I am sure we will come back to this issue later.
  • I am sure that it was without intention.

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