し確かに

and certainly

→ し
phrase Rare #21,450
and certainly し connects clauses or lists points, while 確かに means “certainly” or “indeed.”
JA: この店は確かに便利だし確かに安い。
EN: This store is certainly convenient, and it's certainly inexpensive.

確かに約束したし確かに守った。

I made a promise, and I kept it.

確かにそう言ったし確かに聞いた。

I definitely said that, and I definitely heard it.

確かに届いたし確かに読んだ。

I did receive it, and I did read it.

確かに正しいし確かに難しい。

It's definitely correct, and definitely difficult.

確かにおいしいし確かに高い。

It’s definitely delicious, and definitely expensive.

確かに見たし確かに覚えている。

I definitely saw it, and I definitely remember it.

確かに来たし確かに会った。

I did come, and I did meet them.

確かに聞こえたし確かに見えた。

I definitely heard it, and I definitely saw it.

確かに上手だし確かに早い。

They’re certainly skilled, and certainly fast.

確かに変わったし確かに良くなった。

It’s definitely changed, and it’s definitely gotten better.