Breakdown of A ementa está na mesa.
a mesa
the table
estar
to be (temporary / location)
na
in the / on the / at the (f.sg)
a ementa
the menu
Questions & Answers about A ementa está na mesa.
Why do we use está here instead of é?
How do we get the word na?
Na is a mandatory combination of the preposition em (in/on/at) and the feminine word a (the). Because mesa (table) is a feminine noun, we say a mesa. When we combine em and a mesa, it shrinks into na mesa.