Muszę przykryć dziecko kocykiem, bo śpi.

Muszę means I must / I have to. It is the 1st person singular form of the verb musieć (to have to / must).

• ja muszę = I must
• Polish usually drops the pronoun ja, because the verb ending already shows who the subject is.

So Muszę przykryć... literally means I must cover...

Polish often leaves out subject pronouns when they are clear from the verb form.

• muszę already tells you the subject is I
• adding ja is possible, but it usually adds emphasis

So:

• Muszę przykryć dziecko kocykiem. = normal, neutral
• Ja muszę przykryć dziecko kocykiem. = I have to cover the child, with extra emphasis

This is a question of aspect.

• przykryć is perfective
• przykrywać is imperfective

Here, the speaker means one complete action: to cover the child up. That is why przykryć is natural after muszę in this context.

• Muszę przykryć dziecko. = I need to cover the child up now, as a completed action
• Muszę przykrywać dziecko. = I have to be covering the child / keep covering the child, which sounds less natural here

Przykryć means to cover or to cover up.

It is related to kryć (to cover / hide), and the prefix przy- helps create the verb meaning to put something over something/someone as a covering.

In this sentence, it means covering the child with a blanket.

Because dziecko is a neuter noun, and in the singular its nominative and accusative forms are the same.

Here, dziecko is the direct object of przykryć, so it is in the accusative case. But that accusative form happens to look identical to the dictionary form:

• nominative: dziecko
• accusative: dziecko

So even though the form does not change, the case function does.

Kocykiem is the instrumental singular of kocyk.

After przykryć, the thing used to cover someone is often expressed in the instrumental case:

• przykryć dziecko kocykiem = to cover the child with a small blanket

So:

• dziecko = what is being covered
• kocykiem = what you are covering the child with

Koc means blanket.

Kocyk is a diminutive form, so it means something like:

• small blanket
• little blanket
• sometimes simply a more affectionate or cozy way to say blanket

In sentences about children, kocyk sounds very natural, because it suggests a baby blanket or a child’s blanket.

Its instrumental form is:

• koc → kocem
• kocyk → kocykiem

Bo means because.

It is very common in everyday spoken and written Polish for giving a simple reason:

• Muszę przykryć dziecko, bo śpi. = I have to cover the child because he/she is sleeping.

A more formal alternative would be ponieważ, but bo is the normal everyday choice.

In context, it means the child is sleeping.

Polish often omits subjects when they are easy to understand. So instead of saying:

• bo dziecko śpi

the speaker simply says:

• bo śpi

The subject is understood from the context. Here, the most natural interpretation is that dziecko is the one sleeping.

For the same reason ja is omitted earlier: Polish often drops pronouns when the meaning is clear.

• bo ono śpi is grammatically possible
• but it sounds less natural unless you want contrast or emphasis

Normally, Polish prefers the shorter version:

• bo śpi

Yes. Polish word order is fairly flexible, although some orders sound more natural than others depending on emphasis.

The original sentence is neutral:

• Muszę przykryć dziecko kocykiem, bo śpi.

Other possible versions include:

• Bo śpi, muszę przykryć dziecko kocykiem. = emphasizes the reason first
• Muszę dziecko przykryć kocykiem, bo śpi. = possible, but slightly different in rhythm or emphasis

The original version is a very natural everyday order.

Because Polish has no articles.

English distinguishes between:

• the child
• a child

Polish does not use separate words like the or a/an. The meaning is understood from context.

So dziecko can mean:

• the child
• a child
• sometimes even the baby, depending on context

Here, the context makes it sound like the child.

A simple approximate pronunciation is:

MOO-sheh psheh-KRIHCH JYEH-tsko ko-TSIK-yem, bo shpi

A few useful notes:

• muszę: sz sounds like English sh
• przy- in przykryć is tricky for English speakers; the rz here sounds like zh/sh-like depending on context, but in this word you can think roughly pshe-
• ć at the end of przykryć is a soft ch sound
• dziecko begins with dź/dzie, a soft sound somewhat like jye
• śpi begins with soft ś, similar to a soft sh

Polish stress is usually on the second-to-last syllable:

• MU-szę
• przy-KRYĆ
• dzie-CKO
• ko-CYK-iem