Modemu ikiharibika, hatutaweza kuingia darasa la mtandaoni.

Ikiharibika is made of several pieces:

• i- = the subject marker for modemu
• -ki- = if/when
• haribika = break down, get damaged, become spoiled

So modemu ikiharibika literally means something like if the modem breaks down or when the modem gets damaged.

This is very typical Swahili structure: the subject marker and conditional marker are built into the verb instead of being separate words.

Because modemu is normally treated as a Class 9/10 noun in Swahili.

Many loanwords, especially from English, fall into this class. In the singular, Class 9 nouns often take the subject marker i-.

So:

• modemu imeharibika = the modem has broken
• modemu ikiharibika = if the modem breaks

If you made it plural, the agreement would usually change to zi-:

• modemu zikiharibika = if the modems break

Even when the noun itself does not visibly change form, the agreement markers show the class and number.

This is a very useful verb pair:

• kuharibu = to damage something, to spoil something
  
  • transitive: it takes an object
• kuharibika = to get damaged, to break down, to become spoiled
  
  • intransitive: the thing itself undergoes the change

So:

• Ameharibu modemu = he/she damaged the modem
• Modemu imeharibika = the modem has broken down

In your sentence, the modem is the thing that breaks, so kuharibika is the correct form.

It can mean both if and when, depending on context.

The -ki- form often introduces a condition:

• Ukija, nitafurahi = if you come / when you come, I will be happy
• Mvua ikinyesha, hatutatoka = if it rains, we will not go out

In your sentence, English would most naturally use if:

• Modemu ikiharibika, hatutaweza... = if the modem breaks down, we will not be able...

But in some contexts, it can feel closer to when.

Because Swahili verbs usually pack a lot of grammar into a single word.

Hatutaweza breaks down like this:

• ha- = negative
• tu- = we
• -ta- = future
• wez = be able
• -a = final vowel

So hatutaweza means we will not be able.

This is completely normal in Swahili. What English expresses with several words, Swahili often expresses inside one verb form.

Good question. Swahili negatives do not all behave the same way.

In the present negative, many verbs change the final vowel to -i:

• sifanyi = I do not do
• hatuendi = we are not going

But in the future negative, the final -a stays:

• sitafanya = I will not do
• hatuendi = we are not going
• hatutaweza = we will not be able

So hatutaweza is correct because this is a future negative form.

Because kuweza means to be able, and it is usually followed by an infinitive telling you to be able to do what.

So:

• tunaweza = we can / we are able
• tunaweza kuingia = we can enter / we can join
• hatutaweza kuingia = we will not be able to enter / join

This is similar to English be able to + verb.

Because darasa belongs to noun class 5, and the linking word must agree with darasa.

For Class 5 singular nouns, the associative linker is la.

So:

• darasa la Kiswahili = Swahili class
• darasa la mtandaoni = online class

If the noun were plural madarasa, the linker would change:

• madarasa ya mtandaoni = online classes

So la is there because it matches darasa, not because of mtandaoni.

Mtandaoni comes from mtandao, which means network and often internet, plus the locative ending -ni.

So mtandaoni literally has the sense of:

• on the network
• on the internet
• online

That is why darasa la mtandaoni means online class.

Yes, kuingia literally means to enter or to go into.

But just like in English, verbs of entering can extend to situations like:

• entering a room
• entering a meeting
• entering an online space
• joining a class/session

So in this sentence, kuingia darasa la mtandaoni means something like to get into / join the online class.

Depending on context, English might translate it as enter, access, or join.

Yes. Swahili can place the condition first or second.

Your sentence:

• Modemu ikiharibika, hatutaweza kuingia darasa la mtandaoni.

A reversed version could be:

• Hatutaweza kuingia darasa la mtandaoni modemu ikiharibika.

However, putting the conditional part first is often clearer and more natural, especially in writing. The comma helps show that the first part is the condition.