Saying that you don't know: I have no idea. (informal), I haven’t a clue. (informal), I’m sorry but I’m really not sure., I don’t know but I can try and find out., Saying that you aren't sure / certain, but you have an idea: I’m not a hundred percent certain but it might be …, I’m fairly sure it’s …, I’m not a hundred percent sure but it might be …, I’m fairly certain it’s …, Saying that you know what it isn’t: It’s definitely not …, I’m sure it isn’t …, Saying that you used to know: I can’t remember., I’ve forgotten.,

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