Learn French: Ce marché et ces prix sont parfaits. - This market and these prices are perfect.

Ce is the masculine singular word for "this" or "that", used here because marché is a masculine singular noun. Ces is the plural word for "these" or "those", used because prix is plural in this sentence.

How do we know prix is plural here? Doesn't the singular form also end in "x"?

Exactly! In French, nouns that already end in -s, -x, or -z in the singular do not change their spelling in the plural. We can tell prix means "prices" (plural) because it is introduced by the plural word ces ("these") and followed by the plural verb sont ("are").

If we were talking about feminine plural things, would ces change?

No, it stays exactly the same! While the singular words for "this" change based on gender (ce for masculine, cette for feminine), the plural word ces is used for all plural nouns, whether they are masculine or feminine.

Why is there an -s at the end of parfaits?

Parfaits is an adjective describing both the market and the prices together. Because it describes a plural subject, the adjective must also be plural, so we add an -s to the base word parfait.