Saya membawa satu pir untuk dimakan di kantor.

Bawa is the root word meaning bring/carry/take along.
Membawa is the normal active verb form in standard Indonesian.

The prefix meN- often makes an active verb, and before b it becomes mem-:

• bawa → membawa

So Saya membawa... is the standard way to say I bring / I brought / I am bringing....
Bare bawa is more colloquial and can also sound like a command, depending on context.

Satu literally means one, but it can also do the job that English a/an often does.

So:

• satu pir = one pear or a pear

Indonesian does not have articles like a, an, or the, so learners often see satu used when the speaker wants to make the noun singular and countable.

Yes, you can, if the exact number is not important.

• Saya membawa satu pir... = specifically one/a pear
• Saya membawa pir... = I brought/am bringing pear(s) or some pear, depending on context

Using satu makes it clearer that you mean a single pear.

Yes. Sebuah pir is also natural.

• satu pir = one pear
• sebuah pir = one pear, using the classifier buah

Buah is commonly used for fruits and many concrete objects.
In everyday speech, satu pir is simple and common. Sebuah pir can sound a bit more careful or slightly more formal.

Yes. Pir is the normal word for pear.

You may also hear:

• buah pir = pear fruit / a pear

That is just a slightly fuller way to name the fruit.

Because untuk dimakan ties the purpose directly to the pear.

• untuk dimakan = to be eaten / for eating
• literally, it is something like for being eaten

So satu pir untuk dimakan means a pear intended to be eaten.

If you said untuk makan, that focuses more on the action to eat, not so clearly on the pear as the thing being eaten. In this sentence, untuk dimakan is the more precise and natural choice.

Dimakan comes from the root makan = eat.

With the prefix di-, it becomes a passive form:

• makan = eat
• dimakan = be eaten / eaten

So untuk dimakan means to be eaten.

The passive is useful here because the sentence does not need to say exactly who will eat the pear. It just says that the pear is meant for eating.

These are two different things:

• di- attached to a verb = a passive prefix
• di written separately = a preposition meaning in/at/on

So:

• dimakan = be eaten → passive prefix, written together
• di kantor = at the office → preposition, written separately

This is a very important spelling rule in Indonesian.

The sentence does not say explicitly.

Because it uses the passive dimakan, the eater is left unspecified. In real context, people may assume the speaker will eat it, but grammatically it could also mean someone else at the office will eat it.

So the sentence focuses on the pear's purpose, not on the eater.

Here untuk expresses purpose or intended use.

In this sentence, it means something like:

• for
• in order to
• intended to

So untuk dimakan di kantor means the pear is being brought for the purpose of being eaten at the office.

Most naturally, di kantor goes with dimakan.

So the most natural reading is:

• a pear to be eaten at the office

In other words, the office is the place where the eating happens.

If you wanted to emphasize movement to the office, Indonesian would more naturally use ke kantor.

Because di and ke do different jobs:

• di = at/in/on a place
• ke = to/toward a place

So:

• di kantor = at the office
• ke kantor = to the office

Since this sentence is talking about where the pear will be eaten, di kantor is the right choice.

Indonesian verbs do not change form for tense the way English verbs do.

So membawa can mean:

• bring
• am bringing
• brought
• sometimes even will bring

The exact time usually comes from context or from time words such as:

• kemarin = yesterday
• sekarang = now
• besok = tomorrow
• sudah = already
• sedang = in progress
• akan = will

Without extra context, the sentence itself does not force a single tense.