Note
Where きっと expresses a strong belief or confidence that something will happen or is the case, 確か に often additionally implies that the speaker has evidence or reasoning to support the certainty, or has personally verified the fact.
Breakdown of tasika ni
にni
at; on; in; to; for [indirect object particle]
確かtasika
sure, certain; reliable
Usages of tasika ni
たしか に そう です ね。tasika ni sou desu ne.
That's certainly the case, isn't it?
確か に これ は 彼 の 財布 です。tasika ni kore ha kare no saihu desu.
This is indeed his wallet.
確か に あの 店 は 閉まって いる。tasika ni ano mise ha simatte iru.
That shop is certainly closed.
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