Tafadhali zima swichi hii, kwa sababu fyuzi imeungua tena.

Yes. Zima is the imperative singular form of the verb -zima, which means to switch off / turn off / extinguish.

So in this sentence, zima means switch off! or turn off! when speaking to one person.

A few useful related forms:

• zima! — switch it off! (to one person)
• zimeni! — switch it off! (to more than one person)
• kuzima — to switch off

Swahili imperatives often appear without a subject word, so the you is understood.

Tafadhali means please.

It is commonly placed near the beginning of a request:

• Tafadhali zima swichi hii. — Please switch off this switch.
• Zima swichi hii, tafadhali. — Switch off this switch, please.

So its position is somewhat flexible, much like please in English.

In Swahili, demonstratives like this usually come after the noun, not before it.

So:

• swichi hii — this switch
• kitabu hiki — this book
• mtu huyu — this person

That is a very common word order pattern in Swahili: noun + demonstrative

So swichi hii is the normal way to say this switch.

It is a loanword from English switch.

Modern Swahili uses many borrowed words, especially for technology, electricity, transport, and modern objects. So words like swichi and fyuzi are very common and natural.

Loanwords are often adapted to Swahili spelling and pronunciation:

• switch → swichi
• fuse → fyuzi

This is normal in everyday Swahili.

Yes. Kwa sababu is a fixed expression meaning because.

Examples:

• Nimechelewa kwa sababu mvua ilinyesha. — I am late because it rained.
• Aliondoka kwa sababu alikuwa mgonjwa. — He left because he was sick.

So in your sentence, kwa sababu introduces the reason for the request.

Imeungua comes from the verb -ungua, which means to burn, to get burned, or to be burnt out, depending on context.

The form imeungua breaks down like this:

• i- — subject marker agreeing with the noun class of fyuzi
• -me- — perfect marker, often translated as has
• -ungua — burn / get burnt

So imeungua literally means it has burned or it has got burnt.

With electrical items such as a fuse, this often corresponds to natural English expressions like:

• the fuse has blown
• the fuse has burnt out

Because the verb must agree with the noun fyuzi.

In Swahili, verbs take a subject marker that matches the noun class of the subject. Here, fyuzi takes the marker i- in the singular, so you get:

• fyuzi imeungua — the fuse has burned out

This agreement system is a major feature of Swahili grammar.

Compare:

• mtu amefika — the person has arrived
• kitabu kimeanguka — the book has fallen
• fyuzi imeungua — the fuse has blown/burned out

So the i- is there because of noun class agreement, not because of person like I/you/he in English.

Good question. Swahili often uses -ungua for things like bulbs, wires, or fuses when they burn out or fail because of heat or electrical damage.

So although English often says:

• the fuse blew

Swahili may naturally say:

• fyuzi imeungua

That is a normal and idiomatic way to express the idea. It does not have to mean literal flames; it often means the fuse is burnt out or has failed electrically.

Tena means again.

So it shows that this is not the first time:

• fyuzi imeungua tena — the fuse has blown again / the fuse has burnt out again

Very common uses of tena include:

• Sema tena. — Say it again.
• Karibu tena. — Welcome again / come again.
• Amechelewa tena. — He/she is late again.

No. Swahili does not have articles like English a and the.

That means a noun like fyuzi can mean:

• a fuse
• the fuse

The exact meaning depends on context.

In this sentence, context makes it clear that it means the fuse, because both speaker and listener presumably know which fuse is being talked about.

Yes. The sentence would still be grammatical without tafadhali:

• Zima swichi hii, kwa sababu fyuzi imeungua tena.

That would still mean Switch off this switch, because the fuse has blown again, but it would sound more direct.

Adding tafadhali makes it more polite, especially in a request.

Not always. In writing, the comma can be used to separate the main request from the reason:

• Tafadhali zima swichi hii, kwa sababu fyuzi imeungua tena.

But many writers may also omit it:

• Tafadhali zima swichi hii kwa sababu fyuzi imeungua tena.

Both are understandable. The punctuation is less important than the grammar and meaning.

A rough guide:

• swichi ≈ SWEE-chee
• fyuzi ≈ FYOO-zee
• imeungua ≈ ee-meh-oo-NGOO-ah

A few pronunciation tips:

• Swahili vowels are usually pronounced clearly:
  • i as in machine
  • e as in bet but often purer
  • u as in rule
  • a as in father
• In imeungua, the sequence ngu is pronounced fully, not swallowed.

Swahili pronunciation is generally more regular than English spelling.

You would change the imperative zima to zimeni:

• Tafadhali zimeni swichi hii, kwa sababu fyuzi imeungua tena.

That means you are addressing more than one person.

So:

• zima — switch it off! (one person)
• zimeni — switch it off! (more than one person)

Everything else in the sentence can stay the same.

Yes. Besides using tafadhali, Swahili often softens requests with forms like:

• Naomba uzime swichi hii... — I ask that you switch off this switch...
• Unaweza kuzima swichi hii...? — Can you switch off this switch...?

These can sound softer than a plain imperative.

Still, Tafadhali zima swichi hii... is completely normal and correct. It is a straightforward polite request.