هو يؤكد الموعد أو يغير الموعد، ثم يملأ الاستمارة.

In Arabic, the verb form يؤكد already means he confirms, so هو is not strictly necessary.

You can say:

• يؤكد الموعد أو يغير الموعد، ثم يملأ الاستمارة.

and it still means He confirms the appointment or changes the appointment, then fills out the form.

Adding هو can do a few things:

• make the subject extra clear
• add slight emphasis
• sound more natural in some teaching examples

So هو here is optional, not required.

يؤكد is the present/imperfect form of the verb أكّدَ, which means to confirm or to emphasize, depending on context.

Here it means to confirm.

A useful breakdown:

• past: أكّدَ = he confirmed
• present: يؤكّدُ = he confirms / he is confirming

This is a Form II verb, which often has a doubled middle consonant. You can see that in the شدة on ك:

• يؤكِّد

That doubling is an important part of the verb pattern.

Arabic often repeats the noun where English would use a pronoun.

So this sentence says:

• يؤكد الموعد أو يغير الموعد

literally: He confirms the appointment or changes the appointment

In English, we would probably say:

• He confirms the appointment or changes it

Arabic can also do that:

• يؤكد الموعد أو يغيره

Here ـه means it.

Both are possible, but repeating الموعد is very clear and common, especially in learning materials or formal writing.

They have completely different functions:

• أو = or
• ثم = then

So the structure is:

• يؤكد الموعد أو يغير الموعد = he confirms the appointment or changes the appointment
• ثم يملأ الاستمارة = then he fills out the form

A useful note:

• أو gives a choice or alternative
• ثم shows sequence, usually with a sense of after that

So ثم is not just and. It means the next action happens afterward.

Because ثم clearly shows order.

Compare:

• و = and
• ثم = then / after that

If you say:

• ... ثم يملأ الاستمارة

it means he first confirms or changes the appointment, and only after that does he fill out the form.

If you used و instead:

• ... ويملأ الاستمارة

that would simply mean and he fills out the form, without stressing the sequence as strongly.

So ثم is a better choice when the order matters.

يغير is the present/imperfect form of غيّرَ, meaning to change.

Like يؤكد, it is also a Form II verb:

• past: غيّرَ = he changed
• present: يغيّرُ = he changes / he is changing

It looks different because it comes from a different root:

• أكّد from a root related to confirming
• غيّر from the root غ ي ر, related to changing

But both verbs share the Form II pattern with a doubled middle consonant.

In fully vocalized form:

• يُؤَكِّدُ
• يُغَيِّرُ

يملأ means he fills or he fills out.

It comes from the verb:

• past: ملأَ = he filled
• present: يملأُ = he fills

The final hamza is part of the root of the verb. The root is:

• م ل أ

So the hamza is not something extra added later; it belongs to the word itself.

This is why the verb is written:

• يملأ

not يملا

In this sentence, because the object is الاستمارة (the form), the natural meaning is fills out the form.

الاستمارة is a feminine noun. Many nouns ending in ة (taa marbuuTa) are feminine.

Here:

• استمارة = form
• الاستمارة = the form

But the femininity of الاستمارة does not affect the verb in this sentence, because الاستمارة is the object, not the subject.

The subject is هو / he, so the verbs stay masculine singular:

• يؤكد
• يغير
• يملأ

If الاستمارة were the subject, then feminine agreement could matter.

In fully vocalized MSA, the sentence would be something like:

• هُوَ يُؤَكِّدُ الْمَوْعِدَ أَوْ يُغَيِّرُ الْمَوْعِدَ، ثُمَّ يَمْلَأُ الِاسْتِمَارَةَ.

The important endings are:

• يؤكدُ = verb, indicative -u
• الموعدَ = direct object, accusative -a
• يغيرُ = verb, indicative -u
• الموعدَ = direct object, accusative -a
• يملأُ = verb, indicative -u
• الاستمارةَ = direct object, accusative -a

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

• هو يؤكد الموعد أو يغير الموعد، ثم يملأ الاستمارة.

Because they all have the same subject: he.

So each verb is in the 3rd person masculine singular imperfect/present form:

• يؤكد = he confirms
• يغير = he changes
• يملأ = he fills

This is very common in Arabic. Once the subject is established, a chain of verbs can follow in matching forms.

So the sentence is structurally very neat:

• هو
  • verb
• أو
  • verb
• ثم
  • verb

All three verbs refer to the same person.

By itself, it is present/imperfect, but in Arabic that form can cover several meanings depending on context:

• he confirms
• he is confirming
• he will confirm

In this sentence, the most natural English translation is often simple present:

• He confirms the appointment or changes the appointment, then fills out the form.

But in a procedural context, it could also be understood as something like:

• He will confirm or change the appointment, then fill out the form.

Arabic often relies on context rather than changing the verb form. If you want a clearer future meaning, Arabic might use سـ or سوف.

Yes. A very natural alternative is:

• هو يؤكد الموعد أو يغيره، ثم يملأ الاستمارة.

Here يغيره means changes it.

This version avoids repeating الموعد.

Both versions are correct:

• يؤكد الموعد أو يغير الموعد = very clear, a bit more repetitive
• يؤكد الموعد أو يغيره = more compact and often more natural

Learners often see repetition in Arabic early on because it makes the sentence easier to parse.

Yes, it could.

Arabic allows both:

• هو يؤكد الموعد أو يغير الموعد، ثم يملأ الاستمارة.
• يؤكد الموعد أو يغير الموعد، ثم يملأ الاستمارة.

The second one is also perfectly correct and may sound more straightforward in many contexts.

Starting with هو gives a more explicit subject + predicate structure, while starting with the verb gives a more typical verbal sentence.

So both are normal:

• هو يؤكد... = He confirms...
• يؤكد... = He confirms...

The difference is mostly about style, emphasis, and clarity.

الموعد is usually pronounced approximately as al-maw-ʿid.

A few things to notice:

• مو gives a sound like maw
• ع is the letter ʿayn, a consonant that does not exist in English
• the word is not pronounced like a simple English-style mow-id

So even if the exact ع sound is difficult at first, try to keep a small consonant-like break there.

Also, because م is a moon letter, the ل in ال is pronounced clearly:

• الْمَوْعِد
• not something like أمّوعد

In this sentence, الاستمارة means the form, especially an official or administrative form.

Depending on context, it might be translated as:

• form
• application form
• registration form
• document to be filled out

So يملأ الاستمارة means:

• fills out the form
• completes the form

The exact English wording depends on the situation, but form is the core meaning.