Looking on the internet deeply has found these results:

you will fell down from the stairs is the most popular phrase on the web.

you will fall down from the stairs 11 results on the web	you will fell down from the stairs 151,300,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I saw them leave... Fall down the stairs earlier. Which caused him to fall down the stairs. Something caused him to lose consciousness and fall down the stairs. Skull fracture from a fall down the stairs. Alice's elderly grandmother accidentally had a fall down the stairs and fractured her hip. We thought it would soften the blow for the inevitable fall down the stairs. He might fall down the stairs. Mother died young and the'd fall down the stairs.	Fell down the stairs, hurt your spleen. Because you fell down the stairs last week. They said you fell down the stairs. When that lad fell down the stairs. The day after he fell down the stairs and died. Fell down stairs a week ago. I just fell down the stairs. When you fell down the stairs.

you will fall down from the stairs

11 results on the web

you will fell down from the stairs

151,300,000 results on the web

More popular!

I saw them leave... Fall down the stairs earlier.
Which caused him to fall down the stairs.
Something caused him to lose consciousness and fall down the stairs.
Skull fracture from a fall down the stairs.
Alice's elderly grandmother accidentally had a fall down the stairs and fractured her hip.
We thought it would soften the blow for the inevitable fall down the stairs.
He might fall down the stairs.
Mother died young and the'd fall down the stairs.