يقيم النزيل اليوم.

A careful fully vocalized pronunciation is:

يُقِيمُ النَّزِيلُ اليَوْمَ
yuqīmu an-nazīlu al-yawma

A few notes:

• يقيم = yuqīmu
• النزيل is written with ال but pronounced an-nazīl(u) because ن is a sun letter, so the l of ال assimilates.
• اليوم is pronounced al-yawm(a) because ي is not a sun letter, so the l is pronounced normally.

In natural reading, final short vowels are often not pronounced, but in formal grammar they are there.

يقيم is a verb in the imperfect form, which in Modern Standard Arabic usually covers meanings like:

• he stays
• he is staying
• he resides
• sometimes, depending on context, he will stay

So Arabic does not divide these meanings exactly the way English does. The imperfect often needs context words, like اليوم (today), to make the time clearer.

The dictionary form is usually given as the past tense, 3rd person masculine singular:

أقامَ = he stayed / resided

From that verb, the imperfect is:

يُقِيمُ = he stays / is staying

This verb comes from the root ق-و-م, which is connected to ideas like standing, establishing, staying, or residing, depending on the form and context.

Because Arabic very commonly uses verb-subject-object word order.

So:

يقيم النزيل اليوم
literally: stays the guest today

This is a normal Arabic sentence pattern. English usually wants subject + verb, but Arabic often begins verbal sentences with the verb.

You can also find other word orders in Arabic, but verb first is extremely common.

النزيل is the subject of the verb, even though it comes after the verb.

In this sentence:

• يقيم = the verb
• النزيل = the subject
• اليوم = an adverbial expression of time

If fully vowelled, the subject would be:

النزيلُ

The final ـُ shows that it is nominative, which is the normal case for a subject.

اليوم means today, and here it functions as an adverb of time.

In traditional Arabic grammar, this is a ظرف زمان.

So the structure is basically:

• يقيم = stays / is staying
• النزيل = the guest
• اليوم = today

If fully vowelled, it is usually:

اليومَ

with fatḥa, because adverbial time expressions are commonly in the accusative.

Because ن is one of the sun letters.

When ال is attached to a word beginning with a sun letter, the l sound is not pronounced, and the following consonant is doubled in pronunciation.

So:

• written: النزيل
• pronounced: an-nazīl

But the spelling does not change; only the pronunciation does.

The verb أقام / يقيم has several meanings depending on context, including:

• to stay
• to reside
• to hold or conduct an event
• to establish

In this sentence, because the subject is النزيل and there is a time expression اليوم, the meaning is naturally understood as something like:

• The guest stays today
• The guest is staying today

So yes, يقيم can mean different things in other sentences, but here stay/reside is the natural reading.

Yes.

Arabic imperfect verbs often cover both:

• simple present: stays
• present progressive: is staying

So يقيم النزيل اليوم can be understood as:

• The guest stays today
• The guest is staying today

The exact English choice depends on context and style.

In fully vocalized formal Arabic, the sentence would normally be:

يُقِيمُ النَّزِيلُ اليَوْمَ

The endings are:

• يُقِيمُ → -u because it is an indicative imperfect verb
• النَّزِيلُ → -u because it is the subject, so nominative
• اليَوْمَ → -a because it is an adverbial accusative of time

In everyday pauses and in much spoken Arabic, these final short vowels are often not pronounced, but they are important for understanding grammar.

Yes, Arabic word order is fairly flexible.

This sentence could also appear in other arrangements, such as:

• اليوم يقيم النزيل
• النزيل يقيم اليوم

These all point to roughly the same basic meaning, but the emphasis may change:

• starting with اليوم gives more focus to today
• starting with النزيل gives more focus to the guest

The version يقيم النزيل اليوم is a very normal neutral verbal sentence.