La decisione deve rispettare la legge.

Both decisione and legge are feminine singular nouns, so they take the feminine singular definite article la.

• la decisione = the decision
• la legge = the law

In Italian, the article usually has to agree with the noun in gender and number.

Not exactly. Nouns ending in -e can be either masculine or feminine, so you usually have to learn their gender individually.

Here, decisione is feminine:

• la decisione
• plural: le decisioni

Many nouns ending in -ione are feminine, which is a useful pattern:

• la nazione
• la situazione
• la decisione

Deve means must or has to.

It is the third person singular of dovere (to have to / must):

• io devo = I must
• tu devi = you must
• lui/lei deve = he/she/it must

In this sentence, la decisione is singular, so Italian uses deve:

• La decisione deve... = The decision must...

Because after dovere, Italian normally uses an infinitive.

So:

• deve rispettare = must respect

This works like English:

• must respect
• has to respect

Other examples:

• Devo studiare = I have to study
• La legge deve cambiare = The law must change

Yes, but in legal or formal language, rispettare often means to comply with, to observe, or to follow.

So rispettare la legge can mean:

• respect the law
• obey the law
• comply with the law

The exact English wording depends on context, but the Italian structure is completely normal.

This is the standard Italian word order:

subject + verb + object

• La decisione = subject
• deve rispettare = verb phrase
• la legge = object

Italian word order is often similar to English in straightforward statements.

It is grammatically possible in some contexts, but it is not the neutral, standard order. It sounds marked or stylistically unusual.

If you are simply stating the idea, the most natural version is:

• La decisione deve rispettare la legge.

Italian can move words around for emphasis, but learners should generally stick to the basic order unless there is a special reason.

Because rispettare takes a direct object in Italian.

So you say:

• rispettare la legge
• rispettare le regole
• rispettare il contratto

There is no a or di here.

This is similar to English to respect the law, where the law is also a direct object.

No, not in normal Italian. You would usually need the article:

• deve rispettare la legge

Italian uses articles more often than English does, especially with common nouns. Leaving out la here would sound wrong.

It can do either, depending on context.

• It may refer to a specific law
• It may also mean the law in a general institutional sense

This is similar to English. For example, respect the law can mean the legal system in general, not just one individual law.

The verb would have to agree with the plural subject.

For example:

• Le decisioni devono rispettare la legge. = The decisions must respect the law.

Changes:

• la decisione → le decisioni
• deve → devono

The infinitive rispettare stays the same.

A simple approximation is:

• decisione ≈ deh-chee-ZYOH-neh
• legge ≈ LEJ-jeh

A few helpful points:

• In decisione, the stress is on -o-: decisione
• In legge, the gg before e sounds like the j in judge
• The final e in Italian is pronounced, not silent

Yes, it sounds fairly formal, neutral, and natural, especially in legal, political, or administrative contexts.

That is mainly because of:

• decisione = a formal noun
• rispettare la legge = a phrase common in formal or institutional language

In everyday conversation, someone might say something more specific depending on context, but this sentence itself is perfectly normal Italian.