agnusoinas- I read my comment and I see nothing, just tell me what is no sense for you, if it's about the sound V, I repeat the samething. Here's what Spanish Dict says about it : Do all Spanish speakers pronounce V as B? There is absolutely N O difference in the pronunciation of "B" vs. "V" in Spanish. The most important thing to remember about pronouncing the Spanish b and v is that in standard Spanish they are pronounced exactly alike. Although English makes a clear distinction in how the two letters are pronounced, Spanish does not.
Bebo- when speaking of youself Example- "Yo bebo agua" Bebemos- when speaking of we Example- "Nosotros bebemos agua" (you do not have to put "nosotros in, you can just use "bebemos" I put it in the sentence so you can see it is the subject is we. Bebes- informal you Example- "Tu bebes agua" (I'm not sure if you have come to this yet, but "tu" is the informal of you, as if you were speaking to a close friend, "usted" is when you are speaking to someone you don't know very well or have never met. Therefore "bebes" goes with the informal) Bebe- formal you and also any singular other person (he, she, it) Example- "Usted/El/Ella bebe agua" (I hope what I explained above shows you when to use "usted" and that you use it with "bebe". Furthermore, you never use "ella/el" which means, "she/he" with "bebes" only with "bebe") I hope this sufficiently answers your question
Because the same word with the accent and without the accent is actually two different words, with different meanings. Accents are important because sometimes it is the only difference between two same-spelling words in Spanish.
So in this case: él with the accent means "he" and el without the accent means "the" [masculine form of "the"].
So "Él hombre bebe agua" would mean "He man drinks water" which doesn't make much sense. But "El hombre bebe agua" would mean "The man drinks water" which makes a lot more sense. You could also say "Él bebe agua" ["He drinks water"] but not "El bebe agua" ["The drinks water"].
They are very similar words, but they usually are used in different ways. So you can tell them apart both by noticing if it has the accent or not, and also by where in the sentence the word is being used. Usually only one of them will make a lot more sense, which helps you tell them apart when hearing it spoken.
Hopefully that helps. It's a little tricky at first to notice the accents, but this will come up a lot. For example, "tú" with the accent means "you" but "tu" without the accent means "your". And "esté" is one of the many different conjugated forms of the verb "estar" [estoy, está, estás, esté, estés, estado ...] but "este" without the accent just means "this". And "bebe" is third person/formal of the verb meaning "to drink" ("bebo", "bebes", "bebe" ...) but "bebé" with the added accent means "baby". And obviously we don't drink babies. (It's a joke, sorry.) It all seems a little confusing at first, until you start noticing just how much meaning a little accented letter can change. Once you do become more familiar with the accented letters, it starts to become easier to tell similar words apart because the accent stops being something that feels random to memorise. It becomes more than just spelling.
Hopefully that helps someone make sense of it all.