daitaiki wo karimasu.

It is usually read:

だいたいき を かります。

More naturally, without the learning spaces:

代替機を借ります。

• 代替機 = だいたいき
• を = object marker
• 借ります = かります

You may occasionally hear different pronunciations of 代替 in real life, but だいたいき is the standard reading to learn first here.

代替機 means a replacement device, substitute unit, or loaner device.

It is often used when:

• your phone, computer, or another machine is being repaired
• a company gives you another device to use temporarily
• one machine is used in place of another

The parts are:

• 代替 = substitution / replacement
• 機 = machine / device / unit

So 代替機 is not just any machine; it is a machine or device used instead of the original one.

を marks the direct object of the verb.

The verb 借ります means to borrow, so the thing being borrowed is marked with を.

So:

• 代替機を借ります = (I) borrow a replacement device

If you changed the object, you would still use を:

• 本を借ります = I borrow a book
• 車を借ります = I borrow a car

This is a very common question.

• 借りる / 借ります = to borrow
• 貸す / 貸します = to lend

So:

• 代替機を借ります = I borrow a replacement device
• 代替機を貸します = I lend a replacement device

The direction of the action is different:

• if I receive and use it temporarily → 借りる
• if I give it to someone else temporarily → 貸す

借ります is the polite non-past form.

In Japanese, the non-past can mean:

• present
• future
• sometimes a habitual action

So depending on context, this sentence could mean:

• I borrow a replacement device
• I will borrow a replacement device
• I’m getting/using a loaner device in a practical situation

Very often in a real-world context like repairs or customer service, it feels like I will borrow or I am borrowing.

Yes.

借ります is the polite -ます form of 借りる.

Compare:

• 借りる = plain form
• 借ります = polite form

So this sentence is suitable in normal polite conversation, business situations, or customer-service contexts.

A plain version would be:

代替機を借りる。

That sounds less polite and more like:

• a dictionary form
• a casual statement
• something written in notes or plain conversation

Japanese often leaves out the subject when it is clear from context.

So 代替機を借ります does not explicitly say who is borrowing it. Depending on the situation, it could mean:

• I borrow it
• I will borrow it
• we will borrow it
• sometimes even you will borrow it, if the context makes that clear

If you want to state the subject, you can add it:

• 私は代替機を借ります。 = I will borrow a replacement device.
• 父は代替機を借ります。 = My father will borrow a replacement device.

But in natural Japanese, leaving the subject out is very common.

Because this is a short, natural sentence with the topic omitted.

Japanese does not need a topic marker in every sentence. If the topic is already understood, speakers often just say:

代替機を借ります。

If you want to make the topic explicit, you could say:

• 私は代替機を借ります。 = As for me, I will borrow a replacement device.

So は is not wrong, but it is often unnecessary.

Yes, it can.

借りる basically means to use something that belongs to someone else for a time. In English, that may become either:

• borrow
• rent

depending on the situation.

Examples:

• 図書館で本を借りる = borrow a book from the library
• 車を借りる = borrow/rent a car, depending on context

For 代替機, it usually means something like:

• borrow a loaner device
• get a replacement device to use temporarily

In many repair or service situations, loaner device is the most natural English idea.

You can add から to show the source.

For example:

• 店から代替機を借ります。 = I will borrow a replacement device from the shop.
• 会社から代替機を借ります。 = I will borrow a replacement device from the company.

So the basic pattern is:

A から B を 借ります = borrow B from A

Not in normal Japanese writing.

Standard Japanese would usually be written as:

代替機を借ります。

The spaces are often added in textbooks or learning materials to make the sentence easier to read by showing the word boundaries.

So:

• with spaces = helpful for learners
• without spaces = normal Japanese writing

Both represent the same sentence.