Резак лежит на основе.

Лежит is the 3rd person singular form of the verb лежать.

It can translate as either:

• is lying
• lies
• sometimes simply is in context, if English prefers a more natural phrasing

Russian often uses a specific position verb where English might just use to be. So лежит tells you that the object is in a lying / horizontal resting position.

In the present tense, Russian normally does not use a present-tense equivalent of is in simple statements like this.

So instead of saying something like The cutter is on the base, Russian often says more literally:

• The cutter lies on the base
• or The cutter is lying on the base

Also, Russian likes to describe the physical position of things:

• лежать = to lie
• стоять = to stand
• сидеть = to sit

So лежит gives extra information about how the object is positioned.

Основе is the prepositional case singular of основа.

Base form:

• основа = base, foundation

After the preposition на when it means on in a location sense, Russian often uses the prepositional case:

• на основе = on the base

So the ending changes:

• основа → основе

This is a very common pattern for many feminine nouns ending in -а:

• книга → в книге
• лампа → на лампе
• основа → на основе

Because this sentence describes location, not direction.

With на, Russian often distinguishes between:

• location: on / at → usually prepositional
• direction toward a place/surface: onto → usually accusative

Here:

• Резак лежит на основе. = The cutter is lying on the base.
  This is location, so основе is in the prepositional.

Compare:

• Положи резак на основу. = Put the cutter onto the base.
  Here there is movement toward the surface, so основу is accusative.

Резак usually means something like:

• cutter
• cutting tool
• blade tool
• in some contexts, even torch or cutting device

The exact meaning depends on context. In a technical or mechanical setting, it often refers to a tool used for cutting. A learner should not assume it always means one very specific English object.

Grammatically, резак is a masculine noun.

You can usually tell from the dictionary form:

• резак

Nouns ending in a consonant are often masculine in Russian.

That matches the verb form too:

• лежит = present tense, 3rd person singular
  In the present tense, the verb form itself does not show gender.

But if you changed this sentence into the past tense, gender would become visible:

• Резак лежал на основе. = The cutter was lying on the base.
  лежал shows masculine gender.

Russian has no articles like English a/an/the.

So Резак can mean:

• a cutter
• the cutter

And на основе can mean:

• on a base
• on the base

Which one is correct depends on context. Russian leaves that unstated unless something else makes it clear.

Yes. Russian word order is more flexible than English word order.

The neutral order here is:

• Резак лежит на основе.

But you could also hear:

• На основе лежит резак.

This might put more focus on where it is, or fit better in a particular context.

Very roughly:

• Резак лежит на основе. = neutral, starting with the object being talked about
• На основе лежит резак. = emphasis on location or introducing what is on the base

Both are grammatical.

In Russian, лежать is very commonly used for objects as well as people.

It means that something is in a horizontal or resting position on a surface.

For example:

• Книга лежит на столе. = The book is lying on the table.
• Телефон лежит на полке. = The phone is lying on the shelf.

This is completely normal Russian usage. In fact, it is often more natural in Russian than a simple equivalent of is.

Then Russian would probably use стоять instead of лежать.

For example:

• Резак стоит на основе.

That would suggest the cutter is standing on the base rather than lying on it.

Russian often chooses among these verbs based on physical orientation:

• лежать = lie, be lying
• стоять = stand, be standing
• сидеть = sit, be sitting

This is an important habit to get used to in Russian.

The usual stress is:

• реза́к
• лежи́т
• на основе́? No — here the noun is usually основе́ only in some patterns? Actually for основа, the normal stress is осно́ва, and in the prepositional singular it is на осно́ве.

So the sentence is pronounced:

• реза́к лежи́т на осно́ве

Stress is important in Russian, because it is not always predictable and can affect pronunciation of vowels.

Yes. На основе can also mean based on or on the basis of, especially in formal or academic language.

For example:

• на основе данных = based on data
• на основе анализа = on the basis of analysis

But in Резак лежит на основе, the meaning is physical and literal: on the base.

So context matters a lot with this phrase.