حصة السباحة بتبلش هلا.

حصة means class, lesson, or period. In school contexts, it often refers to one scheduled class period.

So here, حصة السباحة means the swimming lesson or the swimming class.

This is because Arabic is using an iḍāfa structure, often called a noun + noun or construct phrase.

• حصة = lesson/class
• السباحة = the swimming

Together, حصة السباحة literally means something like lesson of the swimming, which in natural English becomes the swimming lesson.

In Arabic, the first noun in this kind of phrase usually does not take الـ. The whole phrase becomes definite because the second noun is definite.

Because حصة ends in ـة (called tāʾ marbūṭa).

When a word like this is said by itself, the ending is usually pronounced like -a or -e in Levantine. But when it is followed by another noun in an iḍāfa phrase, the t sound reappears.

So:

• by itself: حصة ≈ ḥiṣṣe / ḥiṣṣa
• in the phrase: حصة السباحة ≈ ḥiṣṣet is-sbāḥa

That t is completely normal.

السباحة means swimming.

It is the verbal noun or activity noun for to swim. So حصة السباحة is literally swimming class or the swimming lesson.

بتبلش means starts or begins.

It comes from the Levantine verb بلّش = to start / to begin.

So:

• بتبلش = it starts / she starts

In this sentence, it refers to حصة (the lesson), so the meaning is the lesson starts.

In Levantine Arabic, بـ often marks the present tense or a regular/imperfect action.

So the verb is built like this:

• تبلش = start
• بتبلش = starts / is starting

In everyday Levantine, this form can cover several English ideas depending on context:

• starts
• is starting
• does start

With هلا (now), it clearly means something happening right now or just about now.

Because حصة is a feminine singular noun.

In Levantine, present-tense verb agreement changes depending on gender:

• بيبلش = he/it (masculine) starts
• بتبلش = she/it (feminine) starts

Since حصة is feminine, the verb has to match it, so بتبلش is the correct form.

هلا means now or right now.

It is a very common Levantine word. Depending on region, you may also hear:

• هلق
• هلّق
• هسّه in some other dialect areas, though not standard Levantine

In this sentence, هلا adds the idea that the class is starting now.

It can match both, depending on context.

That is very common when translating from spoken Arabic. The Levantine present form here does not always map neatly onto just one English tense.

So in natural English, either of these could work:

• The swimming lesson starts now.
• The swimming lesson is starting now.

If someone is announcing it at that moment, is starting now may sound especially natural in English.

Yes. The sentence you have is very natural, but Levantine allows some flexibility.

For example:

• حصة السباحة بتبلش هلا = neutral, straightforward
• هلا بتبلش حصة السباحة = emphasizes now
• بتبلش حصة السباحة هلا = also possible in speech

The meaning stays basically the same, but the emphasis shifts a little.

A natural Modern Standard Arabic version would be:

تبدأ حصة السباحة الآن

That means the same thing: The swimming lesson starts now.

Compared with that, حصة السباحة بتبلش هلا sounds clearly colloquial Levantine and is what you would expect in everyday conversation.