The context of the phrase is that two have not met in a long time just meet up and are talking to each other, the conversation goes like this:

Person 1 (The one who started the conversation): 久しぶりだな

Person 2: おやおや、誰かと思えば

In the sentence "誰かと思えば" I know that 思えば is on the conditional form, but there's no condition, so what is the meaning of the ば form on this sentence?



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