Dirisha likiwa wazi, hewa safi itaingia chumbani.

Likiwa is built from three parts:

• li- = the subject marker agreeing with dirisha
• -ki- = a marker that often means if, when, or while
• -wa = the verb root from kuwa, meaning to be

So dirisha likiwa wazi literally means something like the window being open, but in natural English it is usually understood as if the window is open or when the window is open.

Because dirisha belongs to noun class 5 in Swahili, and the class 5 subject marker is li-.

That is why you get:

• dirisha likiwa
• not dirisha ikiwa

This noun-class agreement is a major part of Swahili grammar. The verb or verbal form has to match the noun class of the subject.

It can mean any of those, depending on context.

In this sentence, -ki- most naturally gives a conditional or general-time meaning:

• if the window is open
• when the window is open

It does not have to be a strict one-time future condition. It can also describe a general truth: whenever the window is open, fresh air comes in.

Wazi is the word meaning open in the sense of a state or condition.

So:

• dirisha likiwa wazi = if/when the window is open

Here, Swahili is expressing a state, not an action like to open.
If you wanted the action to open something, you would use a different verb, such as kufungua.

So this sentence is about the window being open, not about someone opening it.

This is a very useful distinction:

• dirisha liko wazi = the window is open
• dirisha likiwa wazi = if/when the window is open or with the window being open

So:

• liko wazi is a main statement
• likiwa wazi is a subordinate clause, often giving a condition or circumstance

In other words, liko wazi states a fact, while likiwa wazi sets up the situation for something else to happen.

Itaingia can be broken down like this:

• i- = subject marker agreeing with hewa
• -ta- = future marker
• ingia = enter

So itaingia means it will enter.

Because hewa is the subject, the verb must agree with hewa, not with dirisha or chumba.

Hewa belongs to a noun class that takes i- in the singular.

That is why you get:

• hewa itaingia = the air will enter

This can feel unusual to English speakers, because English verbs do not change this way depending on noun class. In Swahili, though, this agreement is completely normal.

Chumbani means in the room.

It comes from:

• chumba = room
• -ni = a locative ending, often meaning in, at, or to

So:

• chumba = room
• chumbani = in the room

In this sentence, chumbani shows where the fresh air will enter.

Swahili usually does not use articles like English the and a/an.

So:

• dirisha can mean a window or the window
• chumbani can mean in a room or in the room

The exact meaning depends on context. This is very normal in Swahili, and learners should get used to understanding definiteness from the situation rather than from a separate article.

Some Swahili adjectives change to show noun-class agreement, but others do not change much or at all. Safi is one of those forms that often stays the same.

So:

• hewa safi = fresh air
• maji safi = clean water
• nguo safi = clean clothes

A learner might expect every adjective to show a visible prefix, but not all of them do.

Not with dirisha.

Because dirisha is class 5, the correct agreeing form is likiwa.

• correct: dirisha likiwa wazi
• not correct here: dirisha ikiwa wazi

Ikiwa can be correct with nouns that take the i- subject marker, or in more general impersonal constructions, but it does not agree with dirisha.

Yes, but the given order is very natural.

Starting with Dirisha likiwa wazi puts the condition first, which is clear and common:

• Dirisha likiwa wazi, hewa safi itaingia chumbani.

You may also hear other arrangements in real speech, but this version is straightforward and easy to understand. The comma helps show that the first part is a condition or circumstance.

The plural of dirisha is madirisha, and the agreement changes too:

• Madirisha yakiwa wazi, hewa safi itaingia chumbani.

Here:

• madirisha = windows
• yakiwa = if/when they are

So the meaning becomes If the windows are open, fresh air will enter the room.

It can be understood either way, depending on context.

Because of -ki-, the first clause can express a condition or general circumstance, and because of -ta-, the second clause is future:

• in a specific situation: If the window is open, fresh air will enter the room
• as a general truth: When the window is open, fresh air will enter the room

So the sentence can work both as a practical statement about a future result and as a general observation.