I know I had a bath last night, but I don't remember if I had one by myself or with my kid.
I'm sure I had a bath last night, but I don't really remember much about it.
ーI know I had a bath last night, but I don't remember if I had one by myself or with my kid.
「昨夜風呂に入ったことは覚えているけど、一人で入ったか子供と入ったか覚えていない」
to have a bath で「お風呂に入る」
have one (a bath) by myself で「一人風呂に入る」
have one (a bath) with my kid で「子供と一緒に風呂に入る」
ーI'm sure I had a bath last night, but I don't really remember much about it.
「昨夜風呂に入ったのは確かだけど、あんまり（お風呂に入ったことを）覚えていない」
I'm sure ... で「…と確かに思う」
I don't really remember much about ... で「…についてあんまり覚えていない」
ご参考まで！
I don’t remember taking a bath yesterday.
I don’t remember what happened when I took a bath yesterday.
I can’t remember if I took a bath with my kid or by myself.
「昨日、お風呂入った時の記憶がない」は
・記憶がない（don’t remember / can’t remember）
・何の記憶か（taking a bath / what happened）
・どの部分が曖昧か（with my kid / by myself）
カナダ 
アメリカ合衆国 
