Learn Romanian: Tu citești șase cărți.

No, the numbers 3 through 10 have only one form. Unlike 1 (un/o) and 2 (doi/două), șase stays exactly the same no matter the gender of the noun it counts.

How did we get cărți from the singular word carte?

Feminine nouns that end in -e in the singular usually form their plural by changing the -e to -i. Also, the vowel inside the word often changes slightly for easier pronunciation: here, the a becomes an ă, giving us cărți.

Is -ești a common verb ending for "you"?

Yes, for many verbs that end in -i in the dictionary (like a citi, meaning to read). When talking to "you" (singular), you drop the -i and add -ești, giving us citești.

Do I always have to use the word tu (you) in this sentence?

Not necessarily. Because the verb form citești already tells us exactly who is reading, you can just say Citești șase cărți. Including tu just adds a bit of emphasis on the person.

How do I pronounce the special letters in șase cărți?