La muffa copre questa parete.

In Italian, nouns are often used with an article where English might leave it out. La muffa means the mold. In a general statement like this, Italian commonly uses the definite article.

• la = the
• muffa = mold / mildew

So La muffa copre questa parete literally means The mold covers this wall.

Muffa means mold or mildew, the fungus that grows on walls, food, or damp surfaces.

It is a feminine singular noun, which is why it takes la:

• la muffa = the mold

In Italian, every noun has a grammatical gender, usually masculine or feminine. Muffa is simply a feminine noun, so it uses feminine articles and adjectives.

That is why you have:

• la muffa = the mold
• not il muffa

Grammatical gender in Italian does not always match anything logical in English, so it often just has to be learned with the noun.

Copre is the third-person singular present tense of coprire, which means to cover.

So:

• copro = I cover
• copri = you cover
• copre = he/she/it covers

In this sentence, the subject is la muffa, which is singular, so copre is the correct form.

Because the subject is la muffa, which is singular.

Italian verbs must agree with the subject:

• la muffa copre = the mold covers
• le muffe coprono = the molds cover

Copra is not the present indicative form used here. Copre is the normal present tense form for he/she/it covers.

The infinitive is coprire, meaning to cover.

It is a regular -ire verb in this form:

• coprire = to cover
• copre = covers

So the sentence structure is:

• La muffa = subject
• copre = verb
• questa parete = object

In Italian, demonstratives like questo / questa / questi / queste usually come before the noun.

So:

• questa parete = this wall

This is the normal word order. Saying parete questa would sound unnatural in standard Italian.

Because parete is a feminine singular noun.

The demonstrative must agree with the noun:

• questo = this, for masculine singular nouns
• questa = this, for feminine singular nouns

Since it is:

• la parete = the wall

you get:

• questa parete = this wall

Yes. Nouns ending in -e can be either masculine or feminine, so you cannot always know the gender just from the ending.

Parete is feminine:

• la parete = the wall

Its plural is:

• le pareti = the walls

So it is a good idea to learn it together with its article: la parete.

Because copre already means covers. Italian does not need a separate word like is here.

Compare:

• La muffa copre questa parete. = The mold covers this wall.

If you said is covering in English, Italian could also use:

• La muffa sta coprendo questa parete.

But the simple present copre is very natural and common.

The basic word order is:

Subject + Verb + Object

• La muffa = subject
• copre = verb
• questa parete = direct object

So the structure is very similar to English:

• The mold covers this wall.

Yes.

Singular:

• la muffa = the mold
• questa parete = this wall

Plural:

• le muffe = the molds / mold patches
• queste pareti = these walls

A plural sentence would be:

• Le muffe coprono queste pareti.
• The molds cover these walls.

Notice how the article, noun, demonstrative, and verb all change as needed.

A simple pronunciation guide is:

la MOOF-fa KOH-preh KWEHS-ta pa-REH-teh

A few helpful notes:

• muffa has a doubled ff, so hold the f sound a little longer.
• copre sounds roughly like KOH-preh.
• questa begins with kw: KWEHS-ta.
• parete has the stress on re: pa-REH-te.

Sometimes, yes, but they are not exactly the same.

• parete = wall, especially an indoor wall or surface of a room
• muro = wall, often a structural wall, outside wall, or masonry wall

So questa parete is very natural if you are talking about a wall surface inside a room with mold on it.

Yes, it is a natural and correct sentence.

It sounds like a straightforward description:

• La muffa copre questa parete.
• The mold covers this wall.

Depending on context, an Italian speaker might also say:

• C’è della muffa su questa parete. = There is mold on this wall.
• Questa parete è coperta di muffa. = This wall is covered in mold.

But the original sentence is completely correct and natural.