There is (there was)
There are (there were)

-tarkoittaa että jossakin on jotakin

There is milk in the fridge Jääkaapissa on maitoa
There is a dog under the table Pöydän alla on koira

There are girls in the class Luokassa on tyttöjä
There are clouds in the sky Taivaalla on pilviä

It taas käytetaan kun puhutaan minkälaista on, mitä kello on tai kuinka kaukana jokin on

It's nice
It's cold
It's cloudy (Vertaa: There are clouds in the sky)
It's a pity
It's 3 o'clock
It's time (On aika) (Vertaa: There is time - on aikaa)
It's far
It's 15 kilometers to the nearest town