Questi mesi sono pieni.

From Lesson 10:Nouns ending in -e·Italian

Questions & Answers about Questi mesi sono pieni.

Why does the word for "months" end in -i here?
The singular word for "month" is mese, which belongs to a group of nouns that end in -e. To make these nouns plural, the -e changes to -i, giving us mesi.
Is mesi masculine or feminine?
Mese (and its plural mesi) is masculine. You cannot always guess the gender of a noun ending in -e just by looking at it, so it is best to memorize it with its article, like il mese.
Why do we use questi instead of queste?
Questi means "these" for masculine plural nouns. Since mesi is masculine plural, "these months" must be questi mesi. If the noun were feminine plural, you would use queste.
Does the adjective pieni also belong to the -e/-i group?
No, pieni comes from the regular adjective pieno (full), which ends in -o for masculine singular. Because it is describing the masculine plural noun mesi, the -o changes to -i to match.

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