Сегодня я везу детей в школу на машине.

Везу comes from везти, which means to transport/carry someone or something by vehicle.

So the focus here is not just that I am going somewhere, but that I am taking the children there in a car.

Compare:

• Я еду в школу = I am going to school.
• Я везу детей в школу = I am taking the children to school by vehicle.

Also, везу usually suggests one specific trip in one direction, happening now or today.

That is also possible, but it means something slightly different.

• везу = I am taking them on this trip / today / right now
• вожу = I take them regularly / habitually

So:

• Сегодня я везу детей в школу на машине = today, on this particular occasion, I’m taking them by car
• Я вожу детей в школу на машине = I regularly take the children to school by car

This is a very common Russian contrast with verbs of motion.

Yes. The ending -у already shows that the subject is I.

Russian often leaves out subject pronouns when they are clear from the verb. So Сегодня везу детей в школу на машине is possible.

But я is often included for one of these reasons:

• to make the subject explicit
• to add slight emphasis
• to sound clearer, especially in everyday speech

So я is not required, but it is perfectly natural.

Because детей is the direct object of the verb, and дети is an animate plural noun.

In Russian, animate plural nouns usually have:

• nominative plural: дети
• accusative plural: детей

So:

• Дети идут в школу = дети is the subject
• Я везу детей в школу = детей is the object

This is a very important pattern in Russian: for animate plurals, the accusative usually looks like the genitive.

The dictionary form is дети, which is the plural of ребёнок.

This noun is irregular:

• singular: ребёнок
• plural: дети

Then детей is the genitive plural form, and it is also used as the accusative plural because the noun is animate.

So if you see детей, you should connect it back to дети / ребёнок.

Because this sentence shows motion toward a destination.

With в:

• в + accusative = motion into / to
• в + prepositional = location in / at

So:

• в школу = to school
• в школе = in/at school

Compare:

• Дети в школе = The children are at school.
• Я везу детей в школу = I am taking the children to school.

It may look that way from English, but in Russian this is the normal idiomatic way to say by car.

Russian often uses на with forms of transport:

• на машине = by car
• на автобусе = by bus
• на поезде = by train

So here на машине means the means of transportation.

If you say в машине, that usually means in the car physically, focusing on location rather than the method of travel.

Because Russian has no articles.

Russian does not have separate words for a/an or the. Whether something is definite or indefinite is understood from:

• context
• word order
• intonation
• the situation

So детей can mean the children or simply children, depending on context. The same is true for школу and машине.

Yes. Russian word order is fairly flexible because grammatical relationships are often shown by endings rather than position.

This sentence begins with Сегодня to set the time frame first.

Other possible orders include:

• Я сегодня везу детей в школу на машине
• Детей я сегодня везу в школу на машине
• На машине я сегодня везу детей в школу

These do not all sound equally neutral. Changing the order usually changes the focus or emphasis, not the basic meaning.

The version you have is very natural.

It can mean either, depending on context.

Russian present tense often covers:

• something happening right now
• something happening around now
• something planned for today / in the current situation

So Сегодня я везу детей в школу на машине can mean:

• I am in the process of doing it now, or
• this is what I’m doing today, even if I’m not literally on the road at this second

The word сегодня helps create that broader today time frame.

The main word stresses are:

• сегоднЯ
• я
• везУ
• детЕй
• в шкОлу
• на машИне

A natural rhythm would be:

СегоднЯ я везУ детЕй в шкОлу на машИне.

One small pronunciation note: in fast speech, в школу is said smoothly together, almost like one unit.