I thought we would start Lesson Eight today, but when I looked at the Teaching Materials page, I was surprised at how much of Lesson Seven was left to do.
I thought we would get into Lesson Eight today, but when I saw the Teaching Materials page, I realized there was a lot of Lesson Seven remaining.
本当は増えたではなく、まだあるって知らなかったので、「there was a lot left」にしました。