YOU SAID:

I slept all day, so I guess you can say I didn’t do much today.

INTO JAPANESE

私は一日中寝ていたので、今日はあまりしなかったと言えるでしょう。

BACK INTO ENGLISH

I slept all day, so I can say I didn't do much today.

INTO JAPANESE

一日中寝ていたので、今日はあまりしなかったと言えます。

BACK INTO ENGLISH

I slept all day, so I can say I didn't do much today.