how should/would I know
1 of 2phrase (1)
: I don't know
"Is it going to rain?" "How should/would I know?"
how/why should I/we know
2 of 2phrase (2)
—used to say that one does not know the answer to a question and is surprised to be asked it
"Where did they go?" "How should I know?"
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Merriam-Webster unabridged



