A parede da sala é alta e o teto tem uma luz muito forte.

Because da is the contraction of de + a.

• de = of / from
• a = the (feminine singular)

So:

• a parede da sala = the wall of the room / the room’s wall

This kind of contraction is very common in Portuguese:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

This is the subject of the first clause:

• A parede = the wall
• da sala = of the room

So A parede da sala means the wall of the room.

Portuguese often uses the same basic word order as English here:

• A parede da sala é alta
• The wall of the room is tall/high

Because parede is a feminine noun, and adjectives usually agree with the noun in gender and number.

• parede = feminine singular
• so the adjective must also be feminine singular: alta

Compare:

• A parede é alta. = The wall is high/tall.
• O muro é alto. = The wall/barrier is high/tall.

So alta matches parede.

Yes, alto/alta can mean tall or high, depending on the noun.

With a wall, English usually prefers high, but Portuguese still uses alto/alta:

• uma parede alta = a high wall
• um prédio alto = a tall building

So the Portuguese word stays the same, but the best English translation may change depending on context.

É is the third-person singular form of ser in the present tense.

• ser = to be
• é = is

So:

• A parede da sala é alta = The wall of the room is high

This is used because the sentence is describing a characteristic of the wall.

Because the second clause is expressing possession or existence:

• o teto tem uma luz muito forte
• literally: the ceiling has a very strong light

Here:

• tem = has
• from the verb ter = to have

Portuguese often uses ter in places where English might say there is or describe something more indirectly.

Yes, it is understandable and natural enough, especially in everyday speech.

Literally it means:

• the ceiling has a very strong light

In English, you might phrase this differently, such as:

• There is a very bright light on the ceiling
• The ceiling has a very bright light

In Brazilian Portuguese, using ter like this is very common.

Uma luz means a light. The article makes it countable and specific as one light fixture or light source.

• uma luz = a light
• luz by itself can mean light in a more general or abstract sense

Compare:

• O teto tem uma luz forte. = The ceiling has a strong light / a bright light.
• Tem muita luz na sala. = There is a lot of light in the room.

So uma luz refers to one light source.

Because in muito forte, muito is acting as an adverb, not an adjective.

It means very, and adverbs do not change for gender or number here.

• muito forte = very strong
• muito alta = very high
• muito bonito = very pretty
• muito bonita = very pretty

But when muito means much/many/a lot of, it does agree:

• muita luz = a lot of light
• muitos livros = many books
• muitas salas = many rooms

So:

• uma luz muito forte = a very strong/bright light

Literally, yes: forte means strong. But with luz, Portuguese often uses forte where English would more naturally say bright.

So:

• uma luz muito forte literally = a very strong light
• more natural English = a very bright light

This is a common difference between the two languages.

E means and.

It connects the two clauses:

• A parede da sala é alta
• o teto tem uma luz muito forte

So the full sentence is simply joining two ideas:

• The room’s wall is high, and the ceiling has a very bright light.

This is an important point.

• é is pronounced like eh and carries stress
• e is the word and, usually pronounced more lightly, often like ee or a softer vowel in Brazilian Portuguese depending on accent

In this sentence:

• é alta = is high
• e o teto = and the ceiling

So even though they look similar, they are different words with different pronunciation and function.

Grammatically, da sala comes from de + a sala, so depending on context de can sometimes mean from. But in this sentence, the meaning is clearly of the room.

• a parede da sala = the wall of the room not
• the wall from the room

Context tells you the relationship here is possession/location, not movement.

It is talking about one wall, because parede is singular:

• A parede da sala = the wall of the room

If it meant walls in general, you would expect:

• As paredes da sala = the walls of the room

Likewise:

• o teto = the ceiling is also singular

So the sentence describes one wall and one ceiling.

Normally, no. É alta is the natural choice.

Use ser for a more inherent or defining characteristic:

• A parede é alta.

Use estar for a temporary state or condition:

• A porta está aberta. = The door is open.
• A parede está suja. = The wall is dirty.

A wall being high is not a temporary condition, so ser is the correct verb here.