For all I know
Example: For all I know, the keys are still on the table.
Definition
"For all I know" is an expression used to indicate that, based on the speaker's current knowledge, something might be true or possible, but they are not certain. It often introduces a statement with some degree of doubt or speculation.
Etymology
The phrase "for all I know" comes from a combination of words expressing the extent of one's knowledge. It has been used in English since at least the 16th century to convey the idea that, as far as the speaker is aware, something might be the case, leaving room for uncertainty.
Learn to use this expression actively
"For all I know" appears in the Vocaplus list "English - General - Idioms and Proverbs - (C1) - set 1", containing 130 commonly used expressions.
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