Breakdown of Если на улице мокро, лучше переобуться в тапочки у двери.
Questions & Answers about Если на улице мокро, лучше переобуться в тапочки у двери.
На улице is the normal Russian way to say outside / in the street / outdoors.
- улица means street
- на улице literally means on the street, but very often it simply means outside
- In this sentence, Если на улице мокро means If it’s wet outside
Also, улице is in the prepositional case because it follows на in a location meaning:
- на улице = on the street / outside
- compare with в доме = in the house
So this is just the standard idiomatic expression Russian uses.