Is it grammatically correct to say "Of that, I'm sure" instead of "I'm sure of that? Examples:

  1. My friend: Are you sure the covid-19 epidemic is gonna be done soon?
    Me: Of that, I'm sure.

  2. We need peace, of that I'm sure.

  • 2
    Yes, people say this.
    – mjjf
    Dec 19, 2020 at 8:14
  • It would be good if you add a coma after 'Of that'.
    – lee
    Dec 19, 2020 at 8:35
  • "My life is brilliant, My love is pure, I saw an angel. Of that I'm sure" youtube.com/watch?v=J43Z9XKj4DA Dec 19, 2020 at 12:35

2 Answers 2


Of that I'm sure.

Yes it is correct. I would say it is unlikely to be heard in casual conversation and perhaps more likely in a speech or in writing.

Real examples

No one in my adopted family had that name; of that I am sure.

Google Books

of that I am positive

of that I am certain

Of that I am clear

of That I am most certain

Google Books

  • "My life is brilliant, My love is pure, I saw an angel. Of that I'm sure" youtube.com/watch?v=J43Z9XKj4DA Dec 19, 2020 at 12:38
  • Can I conclude: although it's grammatically correct, in spoken English (British) it's better to say "I'm sure of that"? Dec 19, 2020 at 12:40
  • It's always best to give a sample conversation showing how you yourself want to use the word or phrase. People don't usually just stand outdoors and shout "I'm sure of that!"! English usage is very dependent on context so we need to know how the (imaginary) conversation went before this in order to answer accurately. Dec 19, 2020 at 12:50
  • Yeah, you're right it, you can't tell if something's right until you know the context.
    – lee
    Dec 19, 2020 at 15:07

Yes there's no problem with 'Of that, I'm sure', provided you punctuate it correctly.
To be precise, there's no problem with starting a sentence with 'of'. Poets are the ones, who take the most advantage of this. Though your sentences are grammatically correct, I would suggest some edits in them:

"Of that, I'm sure."
"We need peace. Of that, I'm sure."

Hope it helps:)

  • 1
    Yes. In speech-making, or in writing - and of course songs and poems! Dec 19, 2020 at 12:41
  • 1
    I am not so certain that a comma is needed in such a short sentence. In fact if you click through to the examples I gave in my answer, I don't think even one of them used a comma. Maybe you can find examples? Dec 19, 2020 at 12:43
  • Of that, you're right. hmmmmmmmmmmmmmm. I mean Of that you're right. It's not really required to add that coma.
    – lee
    Dec 19, 2020 at 15:10

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