Ta zabawka leży pod stołem, bo maluch zostawił ją tam rano.

Ta means this.

Polish demonstratives change to match the noun’s gender, number, and case.
Here, zabawka is:

• feminine
• singular
• nominative (because it is the subject)

So the correct form is ta zabawka.

Compare:

• ten stół = this table
• ta zabawka = this toy
• to okno = this window

Because zabawka is the subject of the first clause: it is the thing that is lying somewhere.

In Polish, subjects are normally in the nominative case, and the nominative singular form here is zabawka.

If it were a direct object, the form might change. For example:

• Widzę zabawkę = I see the toy

There, zabawkę is accusative, not nominative.

Leży comes from leżeć, meaning to lie / to be lying. It describes the toy’s physical position.

So leży pod stołem means the toy is specifically lying under the table, not just existing there.

If you used jest, it would simply mean is, which is less natural if you want to describe where an object is positioned physically.

Compare:

• Książka jest na stole = The book is on the table
• Książka leży na stole = The book is lying on the table

Both can be possible, but leży is often more vivid and specific.

Because pod can take different cases depending on whether you mean location or movement.

• pod + instrumental = location, under
• pod + accusative = movement toward a position under something

Here the toy is already there, so it is a location idea:

• pod stołem = under the table

Compare:

• Zabawka leży pod stołem. = The toy is under the table.
• Wsunął zabawkę pod stół. = He pushed the toy under the table.

So:

• pod stołem = where it is
• pod stół = where it is moved

Because after pod in a location meaning, the noun must be in the instrumental case.

The instrumental singular of stół is stołem.

So:

• stół = table
• pod stołem = under the table

This is one of the common things English speakers have to get used to in Polish: prepositions often require specific cases, and the noun changes form because of that.

Bo means because.

It is very common in everyday Polish and sounds natural in speech and informal writing.
Ponieważ also means because, but it is usually a bit more formal or neutral in style.

So:

• bo = because, everyday/common
• ponieważ = because, slightly more formal

In this sentence, bo is the most natural choice.

Because in Polish, a clause introduced by bo is normally separated by a comma.

So the sentence is divided into two parts:

• Ta zabawka leży pod stołem
• bo maluch zostawił ją tam rano

This comma is standard Polish punctuation.

Maluch literally means something like little one or small child. In context, it usually means:

• toddler
• little kid
• young child

It is a warm, informal word. It sounds more personal and natural than a very clinical description.

So it is not just a neutral label; it often carries an affectionate tone.

Zostawił is the past tense, masculine singular form of zostawić (to leave).

In Polish past tense, the verb agrees with the subject in gender and number.

The subject here is maluch, which is grammatically masculine singular, so the verb is:

• zostawił = masculine singular

Compare:

• maluch zostawił = the little one left
• dziewczynka zostawiła = the girl left
• dziecko zostawiło = the child left

Because zostawił is perfective, which presents the action as completed.

Here the idea is that the child left the toy there as a finished action, and now the result remains: the toy is under the table.

By contrast, zostawiał would be imperfective and would suggest repeated action, an ongoing action, or background description, which does not fit as well here.

So zostawił is the natural choice for a completed event in the past.

Because ją is the accusative form of the pronoun ona (she/it), and here the pronoun is a direct object.

It refers back to zabawka, which is a feminine noun.

So:

• ona = she / it (subject form)
• ją = her / it (object form)

In this sentence, the child left it, so Polish needs the object form:

• zostawił ją = left it

Tam means there.

It reinforces the location from the second clause’s point of view: the child left it there in that place.

So even though pod stołem already gives the location, tam still sounds natural because it links the two clauses:

• now the toy is under the table
• because the child left it there

It adds a small sense of connection and emphasis rather than completely new information.

Because rano is an adverb, and it can mean in the morning or this morning, depending on context.

Polish often uses time adverbs without a preposition:

• rano = in the morning / this morning
• wczoraj = yesterday
• dzisiaj = today
• jutro = tomorrow

So tam rano is natural Polish for there in the morning / there this morning.

Polish word order is fairly flexible, although some orders sound more neutral than others.

This sentence has a natural, standard order:

• Ta zabawka leży pod stołem, bo maluch zostawił ją tam rano.

But parts of it could be moved for emphasis. For example, rano could be placed earlier if you wanted to stress the time.

Even so, not every rearrangement sounds equally natural, and pronouns like ją often stay close to the verb.

So the sentence’s current order is a good neutral model for learners.