Я помогу тебе донести сумку до машины.

Помогу is the 1st person singular future form of помочь (to help, perfective).

• я помогу = I will help
• я помогаю = I am helping / I help (present, imperfective)
• помочь = the dictionary form, to help

Since the sentence talks about a future action, Russian uses помогу.

Because помочь / помогать usually takes the person being helped in the dative case.

• ты = you (subject form)
• тебе = to you / for you (dative)

So:

• Я помогу тебе = I will help you

This is a very common pattern in Russian:

• Я помогу маме
• Он помогает другу

Russian often uses this structure:

• помочь кому? + infinitive

It means to help someone do something.

So:

• Я помогу тебе донести сумку = I’ll help you carry the bag

Other examples:

• Я помогу тебе открыть дверь = I’ll help you open the door
• Она помогла мне найти ключи = She helped me find the keys

Донести means to carry something to a destination / all the way there. The prefix до- adds the idea of reaching an endpoint.

Compare:

• нести = to carry, to be carrying
• донести = to carry all the way to, to bring/carry as far as

Because the sentence includes a destination — до машины — донести fits very naturally.

So the idea is not just carry, but carry it to the car.

The main difference is completion / reaching the destination.

• нести focuses more on the process of carrying
• донести focuses on successfully carrying it to the endpoint

So:

• Я помогу тебе нести сумку = I’ll help you carry the bag
  
  • more about the activity itself
• Я помогу тебе донести сумку до машины = I’ll help you carry the bag to the car
  
  • clearly includes the result: reaching the car

In this sentence, донести is more precise because the destination is stated.

Because сумка is the direct object of донести.

You are carrying what?

• сумку = the bag

For a feminine noun like сумка, the accusative singular is:

• сумка → сумку

This is a very standard pattern:

• читать книгу
• открыть дверь
• нести сумку

Because the preposition до always takes the genitive case.

• до = up to / as far as / to
• машина → машины in the genitive singular

So:

• до машины = to the car / as far as the car

This is the normal case pattern after до:

• до дома
• до станции
• до двери

Both can sometimes be translated as to the car, but the nuance is a little different.

• к машине = toward the car / up to the car
• до машины = as far as the car, all the way to the car

With донести, до машины sounds very natural because it emphasizes carrying the bag all the way to that point.

So the combination донести до машины is a very common and natural one.

Yes. Russian word order is flexible, though different orders change the emphasis.

Neutral order:

• Я помогу тебе донести сумку до машины.

Other possible orders:

• Я тебе помогу донести сумку до машины.
• Тебе я помогу донести сумку до машины.
• Сумку до машины я помогу тебе донести.

The original sentence sounds natural and neutral. Other orders may add emphasis, contrast, or sound more literary/conversational depending on context.

Yes, if the subject is clear from context.

• Помогу тебе донести сумку до машины.

Russian often drops subject pronouns when they are understood from the verb form. Since помогу clearly means I will help, я is not always necessary.

Including я can make the sentence:

• clearer,
• slightly more emphatic,
• or more contrastive.

Because both actions are understood as single completed events.

• помогу = I will help (a completed act of helping)
• донести = carry all the way to the car (completed reaching of the destination)

This is very normal in Russian. The sentence presents the whole event as something that will happen and be completed.

If you used imperfective forms instead, the focus would shift more toward the process or repeated action.

Usually, yes. The verb нести and its prefixed forms like донести normally imply carrying by hand / on one’s person.

So донести сумку до машины suggests physically carrying the bag to the car.

If a different method were meant, Russian might use a different verb, for example:

• довезти = take/transport by vehicle
• дотащить = drag to
• доставить = deliver

So донести gives a fairly concrete physical image.

Russian has no articles, so сумку can mean either:

• the bag
• a bag

The exact meaning depends on context.

So this sentence could mean:

• I’ll help you carry the bag to the car
• I’ll help you carry a bag to the car

In real conversation, the situation usually makes it obvious which one is meant.