What is the meaning and usage of both please explain?
How am I to know?
How was I to know?(can provide more context).
" is not used in English. " is okay. This would be used, for example, in the following: A: "You hurt her feelings by joking about mental illness.
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"How am I to know?" is not used in English.
"How was I to know?" is okay. This would be used, for example, in the following:
A: "You hurt her feelings by joking about mental illness. Her sister is in a mental ward."
B: "Oh, I'm sorry, but how was I to know?"