you are

(singular)

he, she, it is

or

"is" by itself

they are

or

are (by itself)

no

by no means

no

(add to a sentence to make it negative)

Non sunt in Antartica.

= they are not in Antartica

Added to the end of the verb to make a question, then move verb to front of sentence

Estne Julia in casa?

= Is Julia in the house

Suntne animalia in silva?

=Are (the) animals in the woods?