zenzen
at 2021-03-21 15:41:25 UTC
I guess: "I certainly received your letter yesterday evening" works just as well. Its use is just too different to anything in English. Sorry for spreading my confusion.
Singou
at 2021-03-22 11:54:41 UTC
You can paraphrase "certain(ly)" also with "I am certain that", which then can be paraphrased further to "I can confirm that". It's just a matter of form/meaning.
Btw., what do you mean with 表現?
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確かに is also a 表現
確かに can also be used as "I can confirm that". 手紙を確かに夕べ受け取りました。I can confirm I received your letter yesterday evening.