Learn Portuguese (Portugal): Vocês querem começar a reunião às quatro? - Do you want to start the meeting at four o'clock?

In English, we say "want to start". But in Portuguese, when you use querer (to want) followed by another action, the second verb stays in its basic dictionary form (the infinitive). Because começar already means "to start", you just place it directly after querem (you want). No extra linking word is needed!

Does "vocês" mean "they" since it ends in "-em" just like "eles querem"?

No, vocês means "you" (plural, like "you guys" or "y'all"). However, in Portuguese, vocês is grammatically treated like a third-person pronoun. This means it always uses the exact same verb endings as eles and elas (they). That is why it takes the form querem instead of a second-person ending.

What does the little accent on "às" in "às quatro" mean?

The word às is a contraction. When telling time, Portuguese uses the preposition a (at) plus the feminine plural word for "the", which is as. This is because the hidden word "hours" (as horas) is feminine plural. When you combine a + as, they merge into às, and the grave accent simply shows that this merger happened. So às quatro literally means "at the four (hours)".

Why does the word "começar" have a little hook under the 'c'?