Breakdown of Se nota que es un día cualquiera, gris y tedioso.
ser
to be
y
and
un
a, an (masculine)
el día
the day
Questions & Answers about Se nota que es un día cualquiera, gris y tedioso.
Why is cualquiera placed after the noun, and why doesn't it shorten to cualquier?
How does se nota que translate to "you can tell that"?
Why do we use es instead of está to describe the day as "gray and tedious"?
We use es (from ser) because it classifies the fundamental nature of the day. You are defining what kind of day it is (an ordinary, boring one). If you only wanted to say "the day is gray" focusing strictly on the temporary weather, you might use está gris, but here you are categorizing the noun día itself.
If I wanted to talk about "ordinary days" in the plural, how does cualquiera change?
It becomes cualesquiera, making the phrase unos días cualesquiera. This is a highly unusual Spanish word because it pluralizes in the middle of the word rather than at the end.