ربما تصبح رسوم التركيب منخفضة.

ربما means perhaps, maybe, or possibly. It adds uncertainty to the statement.

So ربما تصبح gives the sense of may become or might become.

تصبح comes from أصبح, which means to become.

• تصبح = becomes / may become
• تكون = is / may be

So this sentence is about a change of state: the installation fees may become low, not simply be low already.

تصبح is the imperfect form of أصبح.

In this sentence, it is:

• 3rd person
• feminine
• singular

The imperfect in Arabic can refer to the present or future depending on context. With ربما, English usually translates it as may/might become.

Grammatically, تصبح is an imperfect verb, and the imperfect can cover both present and future.

Here, because of the meaning and because ربما expresses possibility, the most natural English sense is future-like:

• may become
• might become

Arabic does not always need a separate future marker like سـ or سوف if the context already makes the meaning clear.

رسوم means fees or charges in this sentence.

It is the plural of رسم in the sense of fee/charge.

A learner may also know رسم as drawing, but Arabic roots often have multiple meanings. Here, the context makes it clear that رسوم means fees.

This is an iḍāfa construction, often called a construct phrase.

• رسوم = fees
• التركيب = the installation

Together, رسوم التركيب means installation fees.

A few important points about iḍāfa:

• The first noun usually does not take ال
• The second noun determines whether the whole phrase is definite
• Since التركيب has ال, the whole phrase is definite: the installation fees

Because ت is a sun letter.

In pronunciation, the ل of ال assimilates to the following sun letter:

• written: التركيب
• pronounced: at-tarkīb

The spelling stays the same, but the pronunciation changes.

Because رسوم is a non-human plural, and in Modern Standard Arabic, non-human plurals are usually treated grammatically as feminine singular for agreement.

That is why you get:

• تصبح rather than a plural verb
• منخفضة rather than a plural adjective

This is a very common rule in Arabic.

Here منخفضة is the predicate of تصبح.

After verbs like كان and its sisters, including أصبح, the predicate is usually indefinite:

• رسوم التركيب = the installation fees
• منخفضة = low

So the structure means the installation fees may become low, not the low installation fees.

If منخفضة had ال, the meaning and structure would be different.

A fully vocalized version would be:

رُبَّما تُصبِحُ رُسومُ التَّركيبِ مُنخَفِضَةً

Why these endings?

• رُسومُ is nominative because it is the subject-like noun of تصبح
• التَّركيبِ is genitive because it is the second noun in the iḍāfa
• مُنخَفِضَةً is accusative because it is the predicate of تصبح, one of the كان-type verbs

In normal unvoweled Arabic writing, these endings are usually not written, so learners often do not see them.