El tauler és sobre la taula.

Because Catalan nouns have grammatical gender, and the article has to match the noun:

• el = masculine singular
• la = feminine singular

So:

• tauler is masculine → el tauler
• taula is feminine → la taula

The endings give you a clue here: nouns ending in -a are often feminine, while nouns ending in -er are often masculine. But those are patterns, not absolute rules.

The accent in és shows both pronunciation and meaning.

• és = is (3rd person singular of ser)
• es = a reflexive/pronominal word, like himself / herself / itself in some contexts

So the accent helps you distinguish the verb form from a different word. It also marks the stressed vowel.

This is a very common question for English speakers, especially if they also know Spanish.

In Catalan, ser is very commonly used for simple location, especially in standard language:

• On és el llibre? = Where is the book?
• El llibre és a la motxilla. = The book is in the backpack.

So El tauler és sobre la taula is perfectly normal.

You may also hear estar in some dialects or in contexts where the speaker wants to stress a temporary position or state, but for a beginner, the important thing is:

• és is normal and correct here

Because sobre by itself is already a complete preposition, so it can go directly before a noun phrase:

• sobre la taula = on the table

You only need de in the longer expression a sobre de:

• a sobre de la taula = on top of the table

So both of these are possible structures:

• sobre la taula
• a sobre de la taula

But they are built differently.

Here sobre means on or on top of.

In other contexts, sobre can also mean about / regarding:

• un llibre sobre història = a book about history

But in El tauler és sobre la taula, the physical context makes the meaning clearly locative: the board is physically on the table.

All three can refer to something being on top of the table, but there are differences in style and regional preference.

• sobre la taula = on the table
• a sobre de la taula = on top of the table
• damunt de la taula = on top of the table

A simple way to think about it:

• sobre is short and straightforward
• a sobre de is very explicit
• damunt de is also very common in many varieties of Catalan

Depending on the region, one form may sound more natural than another in everyday speech.

Yes, but it changes the structure and the nuance.

• El tauler és sobre la taula = The board is on the table.
• Hi ha un tauler sobre la taula = There is a board on the table.

So:

• és is used when you are talking about a specific board
• hi ha is used to introduce the existence of something

That means hi ha often goes with un/una rather than el/la.

Yes, they are related historically, and they also look similar for a reason.

• taula = table
• tauler = board, panel, board-like surface, and in some contexts things like a game board or notice board

Even though they are related, you should learn them as separate vocabulary items, because tauler does not simply mean big table or table-like thing in a predictable way.

The basic order here is very normal:

• El tauler = subject
• és = verb
• sobre la taula = location phrase

So this is a straightforward subject + verb + location sentence.

You can change the order for emphasis, but that often leads to a slightly different structure, for example:

• Sobre la taula hi ha el tauler.

That sounds more like emphasizing the location or presenting what is there. For a learner, the original order is the clearest and safest pattern.

A rough English-friendly guide is:

• taula ≈ TOW-la or TOW-luh
• tauler ≈ tow-LEH

A few notes:

• The au sounds like the vowel in cow
• The stress in tauler falls on the last syllable
• The exact vowels can vary by dialect

So even if your pronunciation is not perfect yet, the most important thing is to stress tauler at the end and keep the au sound clear in both words.