Mwanasayansi anachunguza kemikali.

• Mwanasayansi = scientist
• anachunguza = is examining / examines
• kemikali = chemical / chemicals

So the structure is:

• subject: mwanasayansi
• verb: anachunguza
• object: kemikali

It can be broken down like this:

• a- = subject marker for a singular human subject, such as he/she or a class 1 noun like mwanasayansi
• -na- = present-time marker
• chunguza = verb root meaning examine, investigate, inspect
• final -a = normal verb ending

So anachunguza literally builds the idea he/she is examining or he/she examines.

Because Swahili usually puts the subject information into the verb itself.

In anachunguza, the a- already tells you the verb agrees with a singular human subject. Since the sentence also has the noun mwanasayansi, there is no need for a separate pronoun.

This is very normal in Swahili:

• Mwanasayansi anachunguza... = The scientist is examining...

A separate pronoun would only be added for emphasis or contrast.

Mwanasayansi belongs to the human noun class, usually class 1 in the singular. Class 1 singular subjects take the verb subject marker a-.

So:

• mwanasayansi anachunguza = the scientist examines
• plural: wanasayansi wanachunguza = the scientists examine

Notice how both the noun and the verb change in the plural:

• mwana- → wana-
• a- → wa-

Swahili does not have articles like English does. There is no direct equivalent of a/an/the in a basic sentence like this.

So mwanasayansi can mean:

• a scientist
• the scientist

And kemikali can mean:

• a chemical
• the chemical
• sometimes chemicals, depending on context

The exact English article comes from context, not from a separate Swahili word.

It can often cover both, depending on context.

So anachunguza may be understood as:

• is examining
• examines

In many teaching materials, -na- is introduced as a present or ongoing marker. In real use, the context tells you whether it is a current action or a more general present statement.

It can be either, depending on context.

Many loanwords in Swahili, including kemikali, often have the same form in singular and plural. So kemikali may mean:

• chemical
• chemicals

If the meaning shown to the learner gives one specific English version, that is the intended reading in this sentence. But grammatically, the bare form itself may not show the difference clearly.

Because a basic Swahili statement often follows subject–verb–object order, just like English.

Here:

• Mwanasayansi = subject
• anachunguza = verb
• kemikali = object

That makes this sentence a nice example of a simple, natural Swahili sentence pattern.

Mwanasayansi is a human noun, so it behaves like class 1 in the singular and class 2 in the plural.

• singular: mwanasayansi
• plural: wanasayansi

The verb agreement changes too:

• Mwanasayansi anachunguza kemikali.
• Wanasayansi wanachunguza kemikali.

This is an important pattern for nouns referring to people.

A simple pronunciation guide is:

• Mwanasayansi = mwa-na-sa-YAN-si
• anachunguza = a-na-chun-GU-za
• kemikali = ke-mi-KA-li

Helpful points:

• ch sounds like the ch in church
• every vowel is pronounced clearly
• stress is usually on the second-to-last syllable

So the natural rhythm is roughly:

mwa-na-sa-YAN-si a-na-chun-GU-za ke-mi-KA-li

In Swahili, the verb must agree with the subject, but an object marker is often optional if the object noun is already stated clearly.

Here, kemikali appears directly after the verb, so no object marker is necessary:

• Mwanasayansi anachunguza kemikali.

An object marker is more likely when the object is already known, emphasized, or replaced by a pronoun-like idea. In a simple sentence like this, leaving it out is completely normal.