Я не могу дотянуться до книги на верхней полке.

Дотянуться means to be able to reach as far as something, often by stretching your arm or body.

The -ся ending makes it a reflexive verb, but in many cases like this, it is best learned as part of the whole verb rather than translated literally as oneself.

• тянуть = to pull, to stretch
• тянуться = to stretch oneself / reach out
• дотянуться = to reach all the way to something

So дотянуться до книги means to reach the book in the sense of physically being able to stretch far enough.

This is different from a direct-action verb like взять (to take) or достать (to get / take down).

Because мочь means can / be able to, and like English can, it is followed by another verb.

• Я могу = I can
• Я не могу дотянуться = I can’t reach

So the structure is:

• я = I
• не могу = cannot
• дотянуться = reach

This is very normal Russian grammar: a conjugated modal verb + infinitive.

Because дотянуться normally goes with до + genitive, not with a direct object in the accusative.

So:

• дотянуться до чего? = to reach what?
• до книги = to the book

Even though English says reach the book, Russian uses a prepositional pattern:

• дотянуться до книги
• literally something like reach as far as the book

That is why книги is not the direct object here.

Книги is genitive singular.

The noun is книга (book), and after the preposition до, Russian uses the genitive case:

• nominative: книга
• genitive: книги

So:

• до книги = to the book / as far as the book

This is a case-governed form: до requires genitive.

Полке is prepositional singular.

The phrase на верхней полке means on the top shelf / on the upper shelf, and here на expresses location, not motion.

When на means on / at in a location sense, it usually takes the prepositional case:

• полка = shelf
• на полке = on the shelf

So:

• на верхней полке = on the upper shelf

If there were motion onto the shelf, you would usually see the accusative instead.

Because adjectives must agree with the nouns they describe in gender, number, and case.

The noun полка is:

• feminine
• singular
• here in the prepositional case

So the adjective верхний (upper / top) must match it:

• masculine nominative: верхний
• feminine nominative: верхняя
• feminine prepositional singular: верхней

That is why you get:

• на верхней полке

Because верхний means upper / top, while высокий means high / tall.

These are related ideas, but not the same:

• верхняя полка = the upper shelf / top shelf
• высокая полка = a high shelf

In many situations, English might say the top shelf, and Russian naturally uses верхняя полка.

So на верхней полке is the most natural way to say on the top shelf.

This is a very common question.

• дотянуться до книги = to be able to physically reach the book
• достать книгу = to get the book, take it down, retrieve it

So if your hand is too short to touch it, you say:

• Я не могу дотянуться до книги.

If you mean you cannot successfully get the book down, you might say:

• Я не могу достать книгу.

Sometimes both could fit the situation, but they focus on slightly different things:

• дотянуться = reach far enough
• достать = obtain / take down

Yes, it could be omitted in many contexts.

Russian often leaves out subject pronouns when the verb form already makes the subject clear:

• Не могу дотянуться до книги на верхней полке.

This still clearly means I can’t reach the book on the top shelf.

Including Я can add:

• emphasis
• contrast
• clarity
• a more explicit, complete-sentence feel

So both are possible:

• Я не могу дотянуться...
• Не могу дотянуться...

Дотянуться is perfective.

Its imperfective partner is usually дотягиваться.

Russian often uses a perfective infinitive after мочь when talking about whether a result can be achieved:

• могу сделать = I can do it
• не могу открыть = I can’t open it
• не могу дотянуться = I can’t reach it

Here the idea is I am unable to achieve the result of reaching the book.

So using the perfective infinitive is natural.

Yes. Russian word order is flexible, though some orders sound more natural depending on emphasis.

The given sentence is neutral and natural:

• Я не могу дотянуться до книги на верхней полке.

You could also say:

• Я не могу до книги на верхней полке дотянуться.
• До книги на верхней полке я не могу дотянуться.

These alternatives shift emphasis:

• starting with до книги... highlights the thing that is out of reach
• putting дотянуться later can sound more conversational or emphatic

For learners, the original order is the best one to use first.

In meaning, it tells you where the book is:

• the book is on the top shelf

So the phrase is connected semantically to книги, even though in the sentence it comes after the whole phrase до книги.

In other words:

• до книги на верхней полке = to the book that is on the top shelf

This is a very normal way for Russian to build the phrase.

Yes, it is the same preposition до, but the meaning depends on context.

Common meanings of до include:

• up to / as far as
• until / before

Examples:

• до дома = as far as the house
• до вечера = until evening

In дотянуться до книги, it means as far as the book.

So here it is the spatial meaning, not the time meaning.

The main stress pattern is:

• Я не могУ дотянУться до кнИги на вЕрхней пОлке.

Useful stress points:

• могу́
• дотяну́ться
• кни́ги
• ве́рхней
• по́лке

This matters because Russian stress is mobile and not always predictable. Learning stress together with the word is a good habit.