1blockquote 01cite 10Vincent Teo12cite 12br 10Can I say,12br 12br 10(a) The ball rolls on the stairs. 11font 10This sounds like it goes along one stair, but not down12font 12br 12br 10(b) The ball rolls down the stairs. 11font 10This is the most idiomatic12font 12br 12br 10(c) The ball11del 10s12del 10 rolls the stairs.
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01cite10Vincent Teo12cite12br
10Can I say,12br
12br
10(a) The ball rolls on the stairs. 11font10This sounds like it goes along one stair, but not down12font12br
12br
10(b) The ball rolls down the stairs. 11font10This is the mos
01cite10Vincent Teo12cite10Can I say, 12br1-
12br
10The ball rolls from the stairs. 12br
12br
10I suppose - but it sounds like it falls off the side fo the stairs directly down, and not down one stair at a time. 12br
12blockquote