I didn’t know that you were at home. I didn’t drop in. A. Not knowing that you were at home, but I still dropped in. B. I didn’t know you were at home although I didn’t drop in C. Not know

Not knowing that you were at home, but I still dropped in.

I didn’t know you were at home although I didn’t drop in

Not knowing that you were at home, I didn’t drop in.

If I knew that you were at home, I would drop in.