Learn Polish: Czy lubicie tańczyć?

Lubicie is the "you" (plural) form. Lubić belongs to the -ę / -isz conjugation group. To make the "you plural" form in this group, we add -cie to the stem (lubi-), which gives us lubicie. For comparison, the singular "you" form is lubisz.

Where is the word for "you" in this sentence?

In Polish, the pronoun wy (you, plural) is usually dropped because the verb ending -cie in lubicie already tells us exactly who is doing the liking. You could say Czy wy lubicie tańczyć?, but it sounds unnatural unless you really need to emphasize you as opposed to someone else.

Why doesn't the second verb, tańczyć, change its ending?

Tańczyć means "to dance" and is in the infinitive (the basic dictionary form). Just like in English, when you use two verbs together (like "like to dance"), only the first verb (lubicie) changes to match the person. The second verb stays in its basic, unchanged form.

Does Czy literally translate to "Do"?

In this sentence it translates to "Do", but czy doesn't actually mean "do". Polish doesn't use helper verbs like "do" or "does" to form questions. Instead, czy is a question word placed at the beginning of a statement to turn it into a yes/no question.