Ikiwa una pumu, ni vizuri ukae mbali na moshi.

Ikiwa means if.

It introduces a condition:

• Ikiwa una pumu = If you have asthma

In everyday Swahili, learners will also often hear kama for if:

• Kama una pumu... = If you have asthma...

So ikiwa is correct and clear, but kama is often more common in casual speech.

In Swahili, possession is often expressed with forms of kuwa na = to have.

So:

• una = you have
• literally, it comes from u- (you) + -na (have/with)

Examples:

• una pumu = you have asthma
• una gari = you have a car
• una watoto = you have children

So even though English uses a separate verb have, Swahili often builds this idea into forms like una.

Pumu means asthma.

Swahili usually does not use articles like a, an, or the the way English does. So:

• una pumu literally = you have asthma
• not you have an asthma

This is normal. Many diseases and conditions are said without an article in Swahili.

Ni vizuri means it is good, it is best, or it is advisable, depending on context.

In this sentence, it has the sense of giving advice:

• ni vizuri ukae mbali na moshi
• it is good / advisable that you stay away from smoke

So it is softer than a direct command. It sounds like a recommendation.

Ukae is a subjunctive form. After expressions like ni vizuri (it is good / advisable), Swahili often uses the subjunctive to express what someone should do.

So:

• ni vizuri ukae mbali na moshi
• literally: it is good that you stay away from smoke

Compare:

• unakaa = you are staying / you stay
  This describes an action or habit, not advice.
• kaa! = stay!
  This is a direct command.
• ukae = that you stay / you should stay
  This fits advice or recommendation.

So ukae is the natural choice here.

A simple way to understand ukae is:

• u- = you
• -kae = stay / sit / remain in a subjunctive sense

So ukae means something like:

• that you stay
• you should stay

The base verb is kukaa, which can mean to stay, to remain, to sit, depending on context. Here it means to stay/remain.

Mbali na means far from or away from.

So:

• ukae mbali na moshi = you stay away from smoke

Examples:

• kaa mbali na moto = stay away from the fire
• anaishi mbali na shule = he/she lives far from the school

So mbali = far, and na here helps give the meaning from in this expression.

This is just how the expression works in Swahili.

• mbali na = far from / away from

Even though na often means and or with, in this fixed expression it is part of the phrase meaning from.

So it is best to learn mbali na as one unit:

• mbali na = away from

Moshi means smoke.

So:

• mbali na moshi = away from smoke

It can refer to smoke in general, such as cigarette smoke, cooking smoke, or other irritating smoke.

Not a separate word. The idea of should is expressed by the structure:

• ni vizuri
  • subjunctive

So:

• ni vizuri ukae mbali na moshi

means something like:

• it is good that you stay away from smoke
• you should stay away from smoke

Swahili often expresses advice this way instead of using a single word exactly equal to English should.

Yes.

You could say:

• Kama una pumu, ni vizuri ukae mbali na moshi.

This would also mean If you have asthma, it is advisable to stay away from smoke.

Very roughly:

• ikiwa can sound a bit more formal or written
• kama is very common in everyday speech

Both are correct.

Swahili often uses ni in simple identifying or describing statements without needing a separate word for it.

So:

• ni vizuri = it is good

There is no separate subject pronoun here. This is normal in Swahili.

Other examples:

• ni rahisi = it is easy
• ni muhimu = it is important
• ni sawa = it is okay

It is mainly advice.

Because of ni vizuri and the subjunctive ukae, the tone is:

• it is advisable
• it would be good
• you should

A stronger direct command would sound different, for example:

• Kaa mbali na moshi. = Stay away from smoke.

So the original sentence is gentler and more informative.

Yes. Kukaa is a very common verb with several related meanings, including:

• to sit
• to stay
• to remain
• sometimes to live/reside

In this sentence, ukae mbali na moshi clearly means:

• stay away from smoke
• not sit away from smoke

Context tells you which meaning is intended.

It has two main parts:

1. Ikiwa una pumu
   = If you have asthma

2. ni vizuri ukae mbali na moshi
   = it is advisable that you stay away from smoke

So the full pattern is:

• condition
  • advice

You can use this pattern in other sentences too:

• Ikiwa una homa, ni vizuri upumzike.
  If you have a fever, it is advisable that you rest.

• Ikiwa umechoka, ni vizuri ulale mapema.
  If you are tired, it is good to sleep early.