المرافق جيدة.

In Arabic, the present-tense verb to be is usually omitted in simple statements.

So المرافق جيدة is literally something like the facilities good, but the natural English meaning is The facilities are good.

This is a normal Arabic sentence pattern. If you wanted a past-tense version, you would use كان:

• كانت المرافق جيدة = The facilities were good

It is plural.

Its singular is مرفق. The plural مرافق is a broken plural, which means Arabic changes the internal pattern of the word instead of simply adding a regular ending such as -ون or -ات.

So even though it may not look like an obvious plural at first, it functions as one.

Because المرافق refers to non-human things.

In Modern Standard Arabic, non-human plural nouns usually take feminine singular agreement in adjectives and predicates.

So Arabic says:

• المرافق جيدة = The facilities are good

not:

• المرافق جيدون

That plural adjective form would be used for human masculine plurals, for example:

• الطلاب جيدون = The students are good

Because here جيدة is the predicate of the sentence, not an adjective directly attached to the noun inside one noun phrase.

Compare:

• المرافق جيدة = The facilities are good
• المرافق الجيدة = the good facilities

In المرافق الجيدة, الجيدة is an attributive adjective, so it matches the noun in definiteness and also takes ال.

In المرافق جيدة, جيدة is the part that tells you something about المرافق, so it does not need ال.

A normal pronunciation is:

• al-marāfiq jayyida

In very careful formal reading with full case endings, it would be:

• al-marāfiqu jayyidatun

A few pronunciation notes:

• جيد is pronounced with a doubled y sound: jay-yid
• The final ة in جيدة is usually heard as -a or -ah when you stop at the end of the sentence

In fully inflected Modern Standard Arabic, both words are nominative:

• المرافقُ — nominative subject of the nominal sentence
• جيدةٌ — nominative predicate

So the fully vocalized form is:

• المَرافِقُ جَيِّدَةٌ

In everyday writing, these endings are usually omitted, and in normal speech they are often not pronounced unless the style is especially formal.

Yes.

Without vowel marks, المرافق can be read in more than one way. In this sentence, based on the meaning, it is al-marāfiq, meaning the facilities.

But the same spelling can also represent al-murāfiq, meaning the companion or the accompanying person.

This is very common in Arabic, because short vowels are usually not written, so context helps you choose the correct reading.

• جيد = masculine singular good
• جيدة = feminine singular good

In this sentence, Arabic uses جيدة because المرافق, although plural in meaning, is a non-human plural, and non-human plurals usually behave grammatically like feminine singular nouns.