I wrote "He leaves the stairs in the kitchen", which I was told was correct. I just have no idea of what this sentence means... Is it just an abstract sentence to test me?

The plumber leaves the ladder(singular) in the kitchen because he needs to work on the geyser(hot water heater) in the roof. Nothing wrong with this sentence, at least to a South African...

deixa ....is NO WAY = "keeps"

I think that "ladder" is the object you can transport to everywhere. A painter needs it to paint the corners of the ceiling for example. Correct me if i am wrong. (Sorry my english too jajjaa.)

I like "to leave something (someone) permanently" is to keep it (him,her)... I will tell that the next person being left B-)

A escada is a plural ?