Breakdown of Queste lettere e questi quaderni sono qui.
essere
to be
e
and
qui
here
questi
these (masculine)
Questions & Answers about Queste lettere e questi quaderni sono qui.
Why is it queste for the letters but questi for the notebooks?
In Italian, demonstrative adjectives like "these" must match the gender of the nouns they describe. Lettera is a feminine noun, so its plural uses the feminine queste. Quaderno is masculine, so its plural uses the masculine questi.
I thought feminine words ended in -a. Why does lettere end in -e?
Wait, doesn't sono mean "I am"? Why does it mean "are" here?
Why use qui in this sentence instead of lì?
Qui means "here", which makes perfect sense when using queste and questi ("these"), since they all refer to things physically close to the speaker. If the items were far away, you would say they are lì ("there") and you would refer to them as "those".