Mwanasayansi anachunguza chembe.

Mwanasayansi means scientist. The beginning mwa- is part of the noun’s class pattern, not a separate word like the or a in English.

This noun belongs to the human noun class pair m-/wa-:

• singular: mwanasayansi = scientist
• plural: wanasayansi = scientists

So the mwa- helps show that this is one person.

The a- is the subject prefix. It tells you the subject is he/she or a singular noun in the human class, such as mwanasayansi.

So in:

• Mwanasayansi anachunguza chembe

the verb agrees with mwanasayansi by using a-.

If the subject were plural, you would change it:

• Wanasayansi wanachunguza chembe = Scientists are examining particles.

In this sentence, -na- marks the present tense.

So:

• a-na-chunguza can be understood as:
• a- = he/she
• -na- = present tense
• -chunguza = examine/investigate

Together, anachunguza means he/she is examining, he/she examines, or sometimes he/she is investigating, depending on context.

-chunguza means examine, inspect, investigate, or analyze carefully.

It often suggests looking closely at something in a careful or scientific way. That makes it a very natural verb with mwanasayansi.

You may see it with different prefixes:

• ninachunguza = I am examining
• anachunguza = he/she is examining
• tunachunguza = we are examining

The core meaning stays the same; the prefixes change.

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

So:

• Mwanasayansi can mean a scientist or the scientist
• chembe can mean a particle, the particle, or particles

The exact meaning depends on context. That is very normal in Swahili.

Yes, this sentence follows the very common Subject–Verb–Object order:

• Mwanasayansi = subject
• anachunguza = verb
• chembe = object

So it matches English fairly closely:

• The scientist examines particles

Swahili can sometimes vary word order for emphasis, but Subject–Verb–Object is the standard and safest pattern for learners.

It can depend on context, because some Swahili nouns have the same form in singular and plural.

Chembe often means:

• particle
• particles
• sometimes small piece, grain, or tiny bit, depending on context

If the meaning shown to the learner is particles, that is completely natural. Swahili often leaves number to context unless something else makes it explicit.

To make the subject plural, change both the noun and the verb agreement:

• singular: Mwanasayansi anachunguza chembe.
• plural: Wanasayansi wanachunguza chembe.

Changes:

• mwanasayansi → wanasayansi
• anachunguza → wanachunguza

That is because plural human subjects use wa- on the verb.

A simple learner-friendly pronunciation is:

mwa-na-sa-YAN-si

A few tips:

• mw is said together, almost like mw in mwah
• stress is usually on the second-to-last syllable in Swahili, so here it falls on YAN
• vowels are usually clear and pure:
  • a as in father
  • e as in bet but often steadier
  • i as in machine
  • o as in told without much glide
  • u as in rule

Yes, you often can.

Because the verb already contains the subject prefix a-, anachunguza chembe can mean:

• He/she is examining particles
• The scientist is examining particles, if the person is already clear from context

Swahili often allows subject nouns to be omitted when the context makes the meaning obvious.

Yes. Swahili can add an object marker inside the verb.

In your sentence, the object is stated openly as chembe, so no object marker is needed:

• Mwanasayansi anachunguza chembe.

But if the object has already been mentioned, Swahili may use an object marker instead of repeating the noun. The exact marker depends on the noun class of the object.

This is a more advanced point, but it is good to know that Swahili verbs can pack in a lot of information:

• subject
• tense
• sometimes object
• verb root

So a single verb can be quite detailed.