確かに

Tashikani kare no iu tōri desu ne.

Indeed, it is just as he says.

Tashikani kono sumaho wa takai desu ga, seinō wa batsugun desu.

It is true that this smartphone is expensive, but its performance is outstanding.

Shorui wa tashikani uketorimashita.

I have certainly received the documents.

Tashikani izen, koko ni kita koto ga arimasu.

I am certain I have been here before.

Tashikani nihongo no kanji o oboeru no wa muzukashii desu.

It is certainly difficult to memorize Japanese kanji.

"Ashita wa ame ga furu sō da yo." "Tashikani, sora ga kuraku natte kita ne."

"I heard it's going to rain tomorrow." "Indeed, the sky has started getting dark."