Conjunction
PREPOSITION
Down is a preposition BUT in this sentence it is part of the phrasal verb -- fell down. Sometimes a preposition in a phrasal verb is called a particle
Gashlycrumb Tinies by Edward Gorey begins with "A is for Amy, who fell down the stairs..."
The word bound is a verb, as in "She came bounding down the stairs."Also, it is a noun, as in "She went up the stairs in two bounds."It is an adjective when you say something like "The bus was bound for Missouri."The dictionary gives many more examples, if you are still doubtful.
It depends. If you're describing someone who is actually standing on a step or walking up or down the stairs, you would say "on the stairs". If a person were standing in front of the stairs, you could say "at the stairs" or "at the staircase".
They laugh at me when I fall down the stairs.
PREPOSITION
My own clumsiness caused my fall down the stairs.
for elementary students : letting them remember their funny experiences like stumbling down the stairs.. and others
He died from complications caused by anemia.
1-down 2-stairs.
A cow can climb up stairs but not down.
2 down and stairs
I have personally watched my cow climb down a set of stairs. The disclaimer of cows not being able to climb down stairs probably refers to very narrow stairs.
Down is a preposition BUT in this sentence it is part of the phrasal verb -- fell down. Sometimes a preposition in a phrasal verb is called a particle
he fell down the stairs he fell down the stairs
The basement or the root cellar are often found when you go down stairs.
Stairs go up and come down as well.