المتطوع يكنس نقطة التجمع.

Because this sentence is using subject–verb–object order:

• المتطوع = the volunteer
• يكنس = sweeps / is sweeping
• نقطة التجمع = the assembly point

In Modern Standard Arabic, both SVO and VSO word order are possible.

• المتطوع يكنس نقطة التجمع = The volunteer sweeps the assembly point
• يكنس المتطوع نقطة التجمع = The volunteer sweeps the assembly point as well

The version starting with the subject can feel a bit more like you are highlighting the volunteer.

يكنس is a present-tense verb, pronounced yaknusu in fully vocalized MSA: يَكْنُسُ.

It comes from the past-tense verb:

• كَنسَ = he swept

The present tense pattern here is:

• يَفْعُلُ → يَكْنُسُ

So:

• يـ at the beginning is the marker for he in the present tense
• يكنس means he sweeps, he is sweeping, or sometimes he does sweep, depending on context

Arabic present tense often covers both the English simple present and present continuous.

Because المتطوع is singular masculine.

• المتطوع = the male volunteer
• so the verb is يكنس = he sweeps

If the subject were feminine, you would change the verb:

• المتطوعة تكنس نقطة التجمع = the female volunteer sweeps the assembly point

If the subject were plural, the verb would also change, especially in subject-first word order.

الـ is the Arabic definite article, meaning the.

So:

• متطوع = a volunteer
• المتطوع = the volunteer

Since the sentence is talking about a specific volunteer, Arabic uses الـ.

نقطة التجمع is a very common Arabic structure called an iḍāfa (ضافة), often translated as a genitive construction or noun + noun possessive structure.

It is made of:

• نقطة = point
• التجمع = the gathering / assembly

Together, they mean something like:

• point of gathering
• more naturally in English: assembly point or meeting point

In Arabic, this structure often works where English would use:

• of
• or a noun used like an adjective

So نقطة التجمع literally feels like the point of the gathering, but idiomatically it means the assembly point.

This is a key feature of the iḍāfa construction.

In نقطة التجمع:

• the first noun (نقطة) usually does not take الـ
• the second noun (التجمع) carries the definiteness

Because التجمع is definite, the whole phrase becomes definite:

• نقطة تجمع = a gathering point
• نقطة التجمع = the gathering point / the assembly point

So even without الـ on نقطة, the whole phrase is definite because it is linked to a definite second noun.

Yes. يكنس comes from the root:

• ك ن س (k-n-s)

This root is connected with sweeping or cleaning by sweeping.

The basic past-tense verb is:

• كَنسَ = he swept

The present tense is:

• يَكْنُسُ = he sweeps / is sweeping

Learning roots is very helpful in Arabic because many related words are built from the same three consonants.

Yes.

In MSA, the present tense often covers both ideas:

• he sweeps
• he is sweeping

So المتطوع يكنس نقطة التجمع could mean either:

• The volunteer sweeps the assembly point
• The volunteer is sweeping the assembly point

Usually, context tells you which one is meant.

If you want to emphasize an ongoing action, Arabic may sometimes use context words such as:

• الآن = now

For example:

• المتطوع يكنس نقطة التجمع الآن = The volunteer is sweeping the assembly point now

In everyday writing, short vowels and case endings are usually not written, but in fully vocalized MSA the sentence would be:

• المتطوِّعُ يَكْنُسُ نُقْطَةَ التَّجَمُّعِ

Here is what the endings show:

• المتطوعُ = subject, so it takes ـُ (nominative)
• يكنسُ = present-tense indicative ending ـُ
• نقطةَ = direct object, so it takes ـَ (accusative)
• التجمعِ = second term of the iḍāfa, so it takes ـِ (genitive)

Learners often do not see these endings in normal print, but they are still important in formal grammar.

Arabic expresses definiteness differently from English.

In English, you say:

• the assembly point

In Arabic, definiteness is built into the noun phrase:

• نقطة التجمع

Even though only the second noun has الـ, the whole iḍāfa phrase is definite. So Arabic does not need a separate extra word like English does.

Here are some useful comparisons.

Feminine singular:

• المتطوعة تكنس نقطة التجمع
• The female volunteer sweeps the assembly point

Masculine plural:

• المتطوعون يكنسون نقطة التجمع
• The volunteers sweep the assembly point

Feminine plural:

• المتطوعات يكنسن نقطة التجمع
• The female volunteers sweep the assembly point

Notice that the verb changes to match the subject in subject-first sentences like this one.

The basic meaning would stay the same, but the focus and style may shift slightly.

• المتطوع يكنس نقطة التجمع
  More clearly highlights the volunteer

• يكنس المتطوع نقطة التجمع
  More verbal in style; this word order is also very natural in Arabic

Also, in Arabic, verb agreement can behave differently depending on word order. With a verb-first sentence, especially with plural subjects, the verb is often singular in formal grammar. That is one reason word order matters in Arabic more than in English.

For this singular sentence, both versions are straightforward and correct.