La almohada nueva es muy blanda.

Because almohada is a feminine noun in Spanish, so it takes the feminine article la.

A useful general rule is that many nouns ending in -a are feminine, and almohada follows that pattern:

• la almohada
• una almohada

As always, noun gender in Spanish is grammatical, so it has to match the article and any adjectives that describe it.

Because adjectives usually agree with the noun they describe in gender and number.

Here, almohada is:

• feminine
• singular

So the adjective must also be feminine singular:

• nuevo → masculine singular
• nueva → feminine singular
• nuevos → masculine plural
• nuevas → feminine plural

That is why Spanish says la almohada nueva, not la almohada nuevo.

For the same reason: adjective agreement.

Blanda describes almohada, so it must match:

• almohada = feminine singular
• therefore blanda = feminine singular

Compare:

• el colchón es muy blando = the mattress is very soft
• la almohada es muy blanda = the pillow is very soft

In Spanish, descriptive adjectives often come after the noun.

So:

• la almohada nueva = the new pillow

This is the most neutral, standard order.

If you put nueva before the noun — la nueva almohada — it can sound slightly more emphatic or contrastive, like the new pillow as opposed to the old one. Both are possible, but the meaning or emphasis can shift a little.

Spanish uses both ser and estar for to be, but they are used differently.

Here, es is from ser, which is used for:

• general descriptions
• characteristics
• what something is like

In La almohada nueva es muy blanda, the sentence describes a characteristic of the pillow: it is soft.

Using está would sound less natural here in most normal contexts, because softness is being treated as a quality of the pillow, not a temporary state.

Muy means very and is used before adjectives and adverbs:

• muy blanda = very soft
• muy grande = very big

Mucho usually means much/many/a lot, and it behaves differently.

So:

• muy blanda = correct
• mucho blanda = incorrect

A simple rule:

• muy + adjective/adverb
• mucho/a/os/as + noun
• mucho can also sometimes act as an adverb in other structures, but not here

Yes, blanda is a very natural choice for something physically soft, like a pillow, mattress, or bread.

For example:

• una almohada blanda = a soft pillow
• un colchón blando = a soft mattress

You may also see suave, but that often suggests smooth, gentle, or soft to the touch in a slightly different way. For a pillow’s firmness, blanda is a very good and natural word.

Because Spanish often leaves out subject pronouns when they are not needed.

The subject is already clear from the noun phrase:

• La almohada nueva = the new pillow

So Spanish does not need an extra pronoun. In fact, adding one would usually sound unnecessary here.

Spanish commonly says:

• La almohada nueva es muy blanda not
• Ella es muy blanda

A Spain Spanish pronunciation guide would be roughly:

al-mo-A-da

Key points:

• the h is silent
• the stress falls on ha: almohada
• the d in blanda and almohada is usually softer than English d, especially between vowels

A rough English-friendly approximation:

• ahl-moh-AH-dha in Spain, with a soft d/th-like sound between vowels for some speakers
• but simply saying ahl-moh-A-da is a good start for learners

Yes, both are possible, but they mean different things.

• La almohada nueva = the new pillow
• Una almohada nueva = a new pillow

Spanish uses articles very regularly, so you normally do need one here unless another determiner is present.

For example:

• mi almohada nueva = my new pillow
• esta almohada nueva = this new pillow

In your sentence, la tells us we are talking about a specific pillow.

Yes. That is also correct.

Compare:

• La almohada nueva es muy blanda = the new pillow is very soft
• La nueva almohada es muy blanda = also the new pillow is very soft

The version with nueva before the noun often puts a bit more focus on new as an identifying feature, while almohada nueva sounds like a straightforward description. In many everyday contexts, the difference is small.

The structure is:

article + noun + adjective + verb + adverb + adjective

Breaking it down:

• La = the
• almohada = pillow
• nueva = new
• es = is
• muy = very
• blanda = soft

So the sentence pattern is essentially:

The new pillow is very soft.

This is a very common and useful Spanish structure:

• El coche rojo es muy rápido
• La casa grande es muy bonita
• La almohada nueva es muy blanda