Dobi alisema shati jeupe litakuwa safi kabla ya jioni.

It is the subject of a second clause.

The sentence breaks down like this:

• Dobi alisema = The laundry person said
• shati jeupe litakuwa safi kabla ya jioni = the white shirt will be clean before evening

So shati jeupe is not the thing being said in the sense of a direct object like He said a word. It is the subject of the reported statement.

Dobi means a laundry worker, washer, or laundress/laundry person.

A few useful notes:

• It refers to someone who washes clothes professionally.
• It is not inherently marked for male or female in the way English words like washerman or washerwoman are.
• Swahili often leaves gender unspecified unless context makes it clear.

Alisema can be broken into:

• a- = he/she
• -li- = past tense
• sema = say

So alisema literally means he/she said.

Swahili verbs often pack subject and tense into one word, so one verb can contain information that English would spread across several words.

Swahili often omits that in reported speech, just as English often can.

So:

• Dobi alisema shati jeupe litakuwa safi...

can mean:

• The laundry person said the white shirt would/will be clean...

You can also add kwamba for extra clarity:

• Dobi alisema kwamba shati jeupe litakuwa safi kabla ya jioni.

That would be like saying The laundry person said that the white shirt would be clean before evening.

In Swahili, adjectives usually come after the noun they describe.

So:

• shati jeupe = white shirt

not:

• jeupe shati

This is one of the basic word-order differences from English.

Because shati belongs to noun class 5 in the singular, and adjectives must agree with the noun class.

The adjective stem here is -eupe = white.
With a class 5 singular noun, it becomes jeupe.

So:

• shati jeupe = white shirt

If the noun were plural, it would change:

• mashati meupe = white shirts

This is noun-class agreement, which is a major part of Swahili grammar.

Litakuwa breaks down as:

• li- = subject marker for a class 5 singular noun
• -ta- = future tense
• kuwa = be

So litakuwa means it will be, where it refers to shati.

Because shati is class 5 singular, the verb must use the matching subject marker li-.

Because the subject is shati, and shati is treated as a class 5 singular noun.

In Swahili, verbs agree with the noun class of the subject, not just with person like in English.

So:

• shati → class 5 singular
• class 5 subject marker → li-
• litakuwa = it will be

If the subject were plural:

• mashati yatakuwa safi = the shirts will be clean

Here the subject marker changes to ya- for class 6 plural.

Because safi is one of the adjectives that usually stays the same across noun classes.

So you can say:

• shati safi = a clean shirt
• mashati safi = clean shirts
• nyumba safi = a clean house

Not every descriptive word in Swahili behaves the same way. Some adjectives show clear noun-class agreement, like -eupe in jeupe, while others, especially many borrowed adjectives such as safi, are often invariable.

Because Swahili does not do tense backshifting the way English often does.

In English, after said, we often shift to would be:

• He said the shirt would be clean

In Swahili, if the event is still future relative to the time of speaking in the reported statement, the future can stay future:

• alisema ... litakuwa safi

So the logic is:

• at the time the laundry person spoke, the shirt was not clean yet
• it would be clean later
• therefore the reported clause uses future

Kabla ya means before.

So:

• kabla ya jioni = before evening

It is best learned as a set expression:

• kabla ya + noun

Examples:

• kabla ya kazi = before work
• kabla ya chakula = before food / before the meal
• kabla ya jioni = before evening

You do not need to translate it word-for-word every time; just remember kabla ya as a prepositional phrase meaning before.

Jioni means evening.

It usually refers to the later part of the day, around sunset and the early evening period. In many contexts, translating it as by evening or before evening is natural.

So here:

• kabla ya jioni = before evening / by the evening time

Because Swahili does not normally use articles like English a, an, and the.

So:

• dobi can mean a laundry person or the laundry person
• shati jeupe can mean a white shirt or the white shirt

Context tells you which is most natural. That is very normal in Swahili.