هي تملأ الاستمارة.

هي means she.

In this sentence, it identifies the subject clearly: هي تملأ الاستمارة = She fills out the form.

But in Arabic, you often do not need to say the subject pronoun, because the verb already contains subject information. So:

• تملأ الاستمارة can already mean She fills out the form
• adding هي makes the subject more explicit, and sometimes more emphatic

So both are possible, but هي is not always required.

In the present tense, Arabic verbs change form depending on the subject.

For she with a singular verb, Arabic commonly uses a verb beginning with تـ.

So:

• هي تملأ = she fills
• the تـ at the beginning is part of the present-tense conjugation pattern

This is very common in Arabic. For example:

• هي تكتب = she writes
• هي تقرأ = she reads
• هي تملأ = she fills

Yes. By itself, تملأ can also mean you fill when speaking to one male.

So without context:

• تملأ could mean she fills
• تملأ could also mean you (masculine singular) fill

That is why هي is helpful here: it removes ambiguity and makes it clear that the meaning is she fills.

Because Arabic normally does not use a separate present-tense verb meaning is in sentences like this.

English says:

• She is filling out the form
• She fills out the form

Arabic often uses the present tense verb alone:

• هي تملأ الاستمارة

Depending on context, this can mean:

• She fills out the form
• She is filling out the form

So Arabic does not need a separate present-tense is here.

It can mean either one, depending on context.

Arabic present tense often covers both:

• a simple present meaning: she fills
• a present progressive meaning: she is filling

So هي تملأ الاستمارة could be understood as:

• She fills out the form
• She is filling out the form

If the surrounding context makes the timing clear, Arabic usually does not need a special extra form.

Arabic allows more than one word order.

Two common possibilities are:

• هي تملأ الاستمارة
• تملأ هي الاستمارة or more naturally just تملأ الاستمارة

The version with هي first gives the subject more prominence, somewhat like she is the one who fills out the form or simply a clearer she fills out the form.

A sentence beginning with the verb is also very normal in Arabic. So the order here is correct; it is just one common way to say it.

الاستمارة means the form or the application form, depending on context.

It has:

• الـ = the
• استمارة = form

So:

• استمارة = a form
• الاستمارة = the form

This word is feminine, which you can often recognize from the ending ـة.

Because الـ is the Arabic definite article, meaning the.

So:

• استمارة = a form
• الاستمارة = the form

In the sentence, the object is definite: the form, not just a form.

Arabic often uses a simple verb where English uses a phrasal verb.

English says:

• fill out the form

Arabic says:

• تملأ الاستمارة
• literally: fills the form

So Arabic does not need a separate word corresponding to English out here. The verb ملأ / يملأ already gives the meaning fill in the sense used with forms, spaces, containers, and so on.

The root is م ل أ.

This root is connected with the idea of filling.

The basic past-tense verb is:

• مَلَأَ = he filled

The present form here is:

• تملأ = she fills / you (masc. sg.) fill

Learning the root helps you recognize related forms and vocabulary.

It is pronounced approximately tamla'u in careful Modern Standard Arabic.

A fuller vowelled form is:

• تَمْلَأُ

A few things to notice:

• تَ = ta
• مْ = m with no vowel after it
• لَ = la
• أُ = a hamza with a vowel, here pronounced with a glottal stop plus u in full grammatical pronunciation

So the word has a clear break near the end because of the hamza: tam-la-ʾu.

That letter is a hamza.

Hamza represents a glottal stop, a sound like the brief catch in the throat in the middle of uh-oh.

In تملأ, the hamza is part of the verb itself, because the root is م ل أ. So it is not optional; it belongs to the word.

That is why the verb is written:

• تملأ not
• تملا

In fully vowelled MSA, the sentence can be written:

• هِيَ تَمْلَأُ الاِسْتِمَارَةَ

These endings show grammar:

• هِيَ = she
• تَمْلَأُ = present-tense verb, with ـُ in the full form
• الاِسْتِمَارَةَ = direct object, so it takes ـَ in full case marking

In normal everyday Arabic writing, these short vowels are usually omitted, so you typically see:

• هي تملأ الاستمارة

Because it is the direct object of the verb.

The action is filling, and the thing being filled is the form. That makes الاستمارة the object.

In fully vowelled MSA, the direct object is normally marked with the accusative ending:

• الاِسْتِمَارَةَ

In ordinary writing, that ending is usually not written, but grammatically it is still there.

Yes:

• تملأ الاستمارة

This is completely natural Arabic and can mean:

• She fills out the form
• She is filling out the form

However, without هي, the form تملأ could also be understood as you (masculine singular) fill out the form if the context supports that meaning.

So هي is useful when you want to make she explicit.

Yes, الاستمارة is feminine, but that does not control the verb here.

The verb agrees with the subject, not the object.

In this sentence:

• subject = هي = she
• object = الاستمارة = the form

So the verb is feminine singular because the subject is she, not because form is feminine.

That is an important point: Arabic verb agreement follows the subject, not the direct object.