يأتي الطبيب حالا.

يأتي is in the imperfect verb form, which in Modern Standard Arabic usually covers both the present and the future, depending on context.

So in a sentence like يأتي الطبيب حالا it can mean something like the doctor is coming now / the doctor will come right away, depending on the situation.

The prefix يـ is a normal marker for the 3rd person masculine singular in the imperfect tense.

So يأتي means he comes / he is coming / he will come.

That matches الطبيب, because الطبيب is a singular masculine noun: the doctor.

This is a very common Arabic sentence pattern: verb + subject + other information.

So:

• يأتي = comes / is coming
• الطبيب = the doctor
• حالا = immediately / right now

This VSO order (verb-subject-object/adverbial) is very common in Modern Standard Arabic.

You can also say الطبيب يأتي حالا, with the subject first. That is also correct, but it feels a little different in emphasis.

الـ is the Arabic definite article, meaning the.

So:

• طبيب = a doctor / doctor
• الطبيب = the doctor

Since the sentence is talking about a specific doctor, الطبيب is used.

حالا means immediately, right away, or at once.

In this sentence it acts like an adverb, telling you when the action happens.

So it adds the idea that the doctor is coming without delay.

Yes. حالا is often written fully as حالًا with tanwīn fatḥ and an extra ا in normal spelling conventions.

This is the accusative adverbial form, which is very common for words used adverbially in Arabic.

In fully vowelled Arabic, you may see:

• يأتي الطبيب حالًا

In unvowelled everyday writing, it is often simply written:

• يأتي الطبيب حالا

So the sentence you have is completely normal.

It is pronounced roughly yaʾtī.

A few important points:

• يَ = ya
• أ here represents a hamza, a little catch in the throat
• تِي = tī

So it is not a smooth yati only; there is a slight break: ya-ʾ-tī.

It comes from the verb أتى, which means to come.

Its imperfect form is يأتي.

So this is a common pair to recognize:

• أتى = he came
• يأتي = he comes / is coming / will come

Yes, absolutely.

Both are grammatical:

• يأتي الطبيب حالا
• الطبيب يأتي حالا

The difference is mainly one of word order and emphasis.

Very roughly:

• يأتي الطبيب حالا is a more classic verbal sentence pattern
• الطبيب يأتي حالا puts the doctor in the spotlight first

In Arabic, the verb already contains information about person, number, and gender.

Here, يأتي is already marked as 3rd person masculine singular, so it fits الطبيب.

Because the subject comes after the verb here, Arabic uses the singular verb form in this kind of structure. With a singular subject like الطبيب, that is exactly what you expect anyway.

A common way is:

لا يأتي الطبيب حالا.

This means the doctor is not coming right away or the doctor does not come immediately, depending on context.

For a clearer future meaning, Arabic often uses other particles and structures, but لا is the basic negation learners usually meet first with the imperfect.

You can add the question particle هل at the beginning:

هل يأتي الطبيب حالا؟

That means Is the doctor coming right away?

This is one of the easiest ways to make yes/no questions in Modern Standard Arabic.