Utii wa wanafunzi husaidia darasa kuwa kimya.

Yes. Utii means obedience. It is related to the verb kutii, which means to obey.

So in this sentence:

utii = obedience
kutii = to obey

Here, utii is the subject of the sentence: it is the thing that helps.

This is the normal Swahili way to say the students' obedience or the obedience of the students.

The connector meaning of is based on -a, but it changes form to agree with the first noun. Since utii is an abstract u- noun, the connector appears here as wa.

So:

utii wa wanafunzi = the obedience of the students = the students' obedience

A useful point: wa agrees with utii, not with wanafunzi.

Because the possessive/associative connector in Swahili agrees with the noun that comes first, not the noun after it.

Here the first noun is utii, and nouns like utii take wa in this construction.

So:

• utii wa wanafunzi = students' obedience
• not utii ya wanafunzi

Even though wanafunzi means people, that is not the reason for wa here.

Wanafunzi means students. It is the plural of mwanafunzi.

So:

• mwanafunzi = student
• wanafunzi = students

In this sentence, wanafunzi is not the main subject of the verb husaidia. It is part of the phrase utii wa wanafunzi.

Husaidia comes from the verb kusaidia, meaning to help.

So:

• kusaidia = to help
• husaidia = helps / usually helps / tends to help

In this sentence, it means that the students' obedience helps make the class quiet.

Hu- often marks a habitual, general, or usual action in Swahili.

So husaidia here gives the sense of a general truth:

Students' obedience helps keep the class quiet
or
Students' obedience usually helps the class stay quiet

This is different from talking about one specific moment only.

Also, when hu- is used like this, you do not see the normal subject agreement prefix.

Yes, you could, but the meaning changes slightly.

• husaidia sounds more like a general fact, habit, or usual result
• unasaidia sounds more like a present situation or a less general statement

So:

• Utii wa wanafunzi husaidia darasa kuwa kimya = Students' obedience generally helps the class be quiet
• Utii wa wanafunzi unasaidia darasa kuwa kimya = The students' obedience is helping / helps the class be quiet

Both are possible, but husaidia is better for a broad statement.

Darasa can mean class, and depending on context it may refer to:

• the group of students
• the lesson/class session
• the classroom situation

In this sentence, it most naturally means the class in the sense of the class as a group or classroom setting.

So the idea is that obedience helps the class be quiet.

Because kuwa kimya means to be quiet.

After kusaidia, Swahili can use a structure like:

kusaidia + noun + kuwa + adjective/state

So:

husaidia darasa kuwa kimya = helps the class to be quiet

This is very similar to English help the class be quiet.

Kimya means quiet or silent, but in sentences like this it behaves like an invariable state word. That means it usually does not change form to match the noun.

For example:

• darasa ni kimya = the class is quiet
• wanafunzi wako kimya = the students are quiet
• mtoto yuko kimya = the child is quiet

So in this sentence, kimya stays kimya.

It describes a general truth or usual situation, mainly because of husaidia.

It is saying something like:

As a rule, when students are obedient, it helps the class stay quiet.

If you wanted one specific past event, you would use a different verb form, for example:

Utii wa wanafunzi ulisaidia darasa kuwa kimya jana.
The students' obedience helped the class be quiet yesterday.

Yes. That is a very natural English translation.

Both of these are correct:

• the obedience of the students
• the students' obedience

The second one sounds more natural in everyday English.

No. In standard Swahili, you need the connector here.

So:

• utii wa wanafunzi = correct
• utii wanafunzi = not correct for this meaning

English sometimes puts nouns next to each other very easily, but Swahili usually needs a linking form like wa in this kind of phrase.