Englishfor English speakers
it's
Contraction
—
The contraction of "it is".
Bring you coat. It's raining.
"Where's the book?" "It's on the teacher's desk."
"What's that?" "This? It's just a piece of paper."
—
The contraction of "it has".
It's been a long time since I've had cake.
upstairs
Preposition
—
If something is upstairs, it is on the level at the top of the stairs.
Let us head upstairs, from the kitchen to the bedroom.