مرتب ابي ما بكفي لاجار البيت.

Because Arabic normally leaves out the present-tense verb to be.

So مرتب أبي ما بكفي لأجار البيت is a normal present-tense sentence in Levantine. Arabic just places the parts next to each other, and the is idea is understood.

If you wanted past or future, then a form of كان or another helping word would appear.

Here مرتب means salary or pay.

In Levantine, مرتب is a common everyday word for salary.
راتب is also used and is very widely understood, but it can sound a bit more formal or closer to Standard Arabic.

So both are possible, but مرتب fits well in colloquial speech.

This is the Arabic possessive structure called iḍāfa.

The order is:

• مرتب = salary
• أبي = my father

So literally it is salary of my father.

Arabic does not use an apostrophe-s structure like English, and it does not need a separate word like of here. The possession is shown just by putting the two nouns together in this order.

It is understandable, but it sounds a bit more formal or more Standard-Arabic-like than everyday Levantine.

In everyday Levantine, many speakers would more naturally say things like:

• أبوي
• بيّي in some areas
• بابا in casual family speech

So أبي is not wrong, but it is not the most colloquial choice in many Levantine settings.

ما is the negative marker here. It makes the verb negative.

• بكفي = it is enough / it suffices
• ما بكفي = it is not enough / it does not suffice

This is a very common way to negate present-tense verbs in Levantine.

Because this is Levantine dialect, not full Standard Arabic.

In Standard Arabic, you would expect يكفي.
In Levantine, present-tense verbs usually take a بـ prefix, so the dialect form becomes بيكفي or بكفي, depending on spelling style and regional pronunciation.

So:

• Standard Arabic: يكفي
• Levantine: بيكفي / بكفي

Informal dialect spelling is not fully standardized, so you may see more than one written form.

Because the verb itself already carries that information.

In Arabic, the verb form tells you the person, number, and often gender. Here بكفي is understood as it is enough or it suffices.

The it refers back to مرتب أبي.

So Arabic does not need a separate pronoun the way English often does.

لاجار is لـ + أجار.

• لـ = for / to
• أجار = rent in Levantine

So لاجار البيت means for the rent of the house.

Arabic often attaches short prepositions directly to the following word. So instead of writing them separately, they are written as one unit.

Also, in informal writing, hamzas are often written loosely or omitted, so you may see:

• لاجار
• لأجار

And in more formal language, you may also see إيجار instead of أجار.

Because the phrase refers to a specific house or home: the house.

الـ is the definite article, like the in English. So:

• بيت = a house / house
• البيت = the house / the home

In this sentence, أجار البيت means the rent of the house/home, not rent in a general or indefinite sense.

It is a mix.

Parts of it are clearly colloquial Levantine, especially:

• مرتب
• ما بكفي

But أبي sounds more formal or closer to Standard Arabic than what many people would say in everyday Levantine conversation.

This kind of mixing is very common in real life and in teaching materials. Arabic speakers often move between colloquial and more standard-sounding forms.

A very natural everyday version in many Levantine varieties would be:

مرتب أبوي ما بيكفي لأجار البيت

You might also hear small regional variations in:

• the word for my father
• whether people write بيكفي or بكفي
• whether they say أجار or إيجار

So the sentence you were given is understandable, but a more conversational Levantine version would usually replace أبي with something more colloquial, such as أبوي.