Other Ways to Say "I Don't Know" In Grammar

There are many ways to say I don't know in simple English. You can say, I'm not sure, I don't have that information, or I can't say for sure. These phrases are polite and show that you are honest about what you know. You can also say, Let me find out, or I'll check on that, which shows you are willing to learn more and help find the answer. 

Different Ways to Say "I Don't Know":

I'm not sure.

I have no idea.

I can't say for certain.

I'm uncertain.

I haven't a clue.

I don't have the answer.

That's a good question.

I'm not the best person to ask.

I need to find out.

Let me check on that.

I'll look into it.

I don't have that information.

It's unclear to me.

I'm not familiar with that.

I don't know off the top of my head.

I can't help you there.

I'm not an expert on that.

I haven't figured that out yet.

That's beyond my knowledge.

I can't answer that.

I don't have the details.

That's outside my expertise.

I'm drawing a blank.

I'm in the dark.

I don't have a clue.

Your guess is as good as mine.

I don't have the faintest idea.

I haven't got a notion.

I couldn't tell you.

I'm not aware.

I have to do some research.

I need more information.

I'll need to ask someone else.

That's new to me.

I haven't come across that before.

I don't have the full picture.

I'm not informed about that.

It's not something I know about.

I need to investigate.

That's not my area.

I haven't been briefed on that.

I'm not up to date on that.

I haven't learned that yet.

I don't have the specifics.

It's a mystery to me.

I haven't studied that.

I'm not clued in.

I haven't been told.

I'm clueless.

I'm not in the loop.

I can't give you an answer.

That's beyond me.

I don't have an answer for you.

I'm not privy to that information.

I need to gather more details.

I'm unsure.

I'm not positive.

I can't confirm that.

I can't be certain.

I don't have the facts.

I need to double-check.

I'm not knowledgeable about that.

I'm in the dark about that.

I can't give you a definite answer.

I don't have all the facts.

I haven't looked into it.

I need to consult with someone.

I'm not well-versed in that.

I can't provide an answer.

I need to verify that.

I don't have that knowledge.

I'm not sure about that.

That's not something I know.

I'll need to check that out.

I can't say.

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