「確か」 means "certain" or "sure." It's often used when you believe something to be true, but might not have absolute proof. Can also mean "reliable." Example: 明日は確か雨が降るはずです。(I'm pretty sure it will rain tomorrow.)
「確か」は、それが正しいと信じているときに使います。例:明日は確か雨が降るはずです。
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