بالحفلة كان الكل مبسوط.

بالحفلة is made of:

• بـ = in / at / on, depending on context
• ال = the
• حفلة = party

So بالحفلة means at the party.

In Levantine, بـ is very often used where a learner might expect في. So بالحفلة is a very natural spoken way to say at the party. You can also hear في الحفلة, but بالحفلة sounds more colloquial and very normal.

Arabic word order is more flexible than English. Starting with بالحفلة puts the setting first:

• بالحفلة كان الكل مبسوط = At the party, everyone was happy

This is like setting the scene before giving the main statement. It is very natural in Arabic.

If you changed the order, the meaning would stay close, but the focus would shift a little.

كان puts the sentence in the past.

In Levantine, if you want to say everyone is happy, you can simply say:

• الكل مبسوط

There is no present-tense to be in this kind of sentence.

But for the past, you usually add كان:

• كان الكل مبسوط = everyone was happy

So in this sentence, كان is the word that gives you was.

الكل literally means all of it / all of them / everyone, depending on context.

Here it means everyone.

So:

• الكل مبسوط = everyone is happy

In spoken Levantine, الكل is extremely common and natural. It is more conversational than a more formal word like الجميع.

Here الكل is being treated as a singular collective word, so the adjective appears in the masculine singular:

• الكل مبسوط

This is very common.

Why masculine singular? Because in Arabic, the masculine singular is often the default form when the subject is a general collective like الكل.

That said, in everyday speech you may also hear:

• الكل مبسوطين

This agrees with the idea of the people rather than the grammar of الكل itself. Both exist in spoken Arabic, but الكل مبسوط is completely normal and very common.

مبسوط means happy, glad, or pleased.

In Levantine, مبسوط is the everyday spoken word you will hear all the time.
سعيد also means happy, but it sounds more formal or more like Modern Standard Arabic.

So for natural Levantine conversation:

• مبسوط is the more common choice

Yes, you can, but there is a small nuance.

• بالحفلة كان الكل مبسوط clearly means At the party, everyone was happy
• كان الكل مبسوط بالحفلة can also mean that, but it may sometimes sound a bit closer to everyone was happy with the party

So putting بالحفلة first makes the location meaning clearer: it is the setting of the sentence.

If you want the meaning at the party, fronting it is a very good, natural choice.

A common pronunciation would be:

bil-ḥafle kān il-kell mabsūṭ

A few notes:

• بالحفلة is often pronounced bil-ḥafle
• الكل is often pronounced il-kell or el-kell
• مبسوط is often pronounced mabsūṭ or mabsōṭ, depending on region

Also, حفلة in speech often sounds like ḥafle, with an -e ending, not like careful MSA pronunciation.

It sounds very natural in Levantine.

In Modern Standard Arabic, a more standard version would be something like:

• في الحفلة كان الجميع سعيدًا
• or more formally في الحفل كان الجميع سعيدًا

The Levantine flavor comes from things like:

• بالحفلة instead of a more formal في الحفلة
• الكل instead of الجميع
• مبسوط instead of سعيد

So the sentence is very understandable, but it definitely feels spoken and Levantine rather than formal MSA.

Because this is spoken Levantine, not formal written MSA.

In everyday Levantine, you do not normally pronounce case endings such as:

• -un
• -an
• -in

So you simply say:

• بالحفلة كان الكل مبسوط

not a fully inflected formal version.

This is one of the biggest differences learners notice between spoken Arabic and MSA: spoken Levantine is much simpler in this respect.