ーI'm pretty sure I remember him saying that.
「たしか彼がそんなこと言っていたはず」
I'm pretty sure ... で「たしか…なはず」と言えます。
to remember him saying that で「彼がそんなことを言っていたのを覚えている」
ーI think he was saying something like that.
「彼がそのようなことを言っていたと思う」
to say something like that で「そのようなことを言う」
ご参考まで!
If I remember correctly, I feel like he said something like that.
"たしか、彼がそんなことを言っていた気がする。"
- If I remember correctly, I feel like he said something like that.
- If I'm not mistaken, I think he did say something along the lines of that.
- If I'm not wrong, he did say something like that.