Pažljivo pročitaj šifru.

Pročitaj is the imperative form, used for a command or instruction.

More specifically, it is:

• 2nd person singular imperative
• from the verb pročitati
• used when speaking to one person informally

So the sentence is giving one person an instruction.

If you were speaking to several people, or to one person politely, you would say pročitajte instead.

This is a very common Croatian question because it involves aspect.

• pročitati is perfective
• čitati is imperfective

In commands:

• pročitaj suggests read it through / read it completely
• čitaj suggests read / keep reading / be reading

So Pažljivo pročitaj šifru has the sense of completing the action carefully.

A rough contrast:

• Čitaj šifru. = read the code, keep reading it
• Pročitaj šifru. = read the code all the way through / make sure you read it

Because šifru is the accusative singular form.

The noun šifra is a feminine noun, and here it is the direct object of the verb pročitaj. In Croatian, direct objects often go in the accusative.

For many feminine nouns ending in -a:

• nominative: šifra
• accusative: šifru

So:

• šifra = the basic dictionary form
• šifru = the form used here because it is the thing being read

Pažljivo is an adverb. It describes how the action is done.

Here it tells you how to read:

• pročitaj = read
• pažljivo pročitaj = read carefully

It is related to the adjective pažljiv, which means careful.

So:

• pažljiv čovjek = a careful person
• pažljivo pročitaj = read carefully

No, Croatian word order is fairly flexible.

Pažljivo pročitaj šifru is a very natural and neutral order, but other orders are possible depending on emphasis.

For example:

• Pročitaj šifru pažljivo.
• Šifru pažljivo pročitaj.

These alternatives may sound more marked or place emphasis differently, but they are still understandable.

The given version is a normal instruction and sounds natural.

It is normally left out.

In Croatian, the verb form already shows who the subject is. Since pročitaj is a 2nd person singular imperative, it already means that the command is directed at you.

The pronoun ti is usually unnecessary.

You could add ti only for emphasis, but in ordinary commands it is usually omitted.

You would use pročitajte instead of pročitaj:

Pažljivo pročitajte šifru.

This can mean:

• a command to more than one person
• or a polite command to one person

This is very common in Croatian, where the plural form is also used for polite address.

Šifra can mean several related things depending on context, such as:

• code
• cipher
• password
• sometimes even an identifying code or number

So the exact English translation depends on the situation.

For example, in different contexts šifra might refer to:

• a secret code
• a login password
• a product or reference code

That is why context matters.

These letters are important in Croatian:

• č is pronounced roughly like ch in church
• š is pronounced like sh in shoe
• ž is pronounced like the s in measure

So in this sentence:

• pročitaj starts with a pro-chi- sound
• šifru starts with shi-
• pažljivo contains the ž sound, like zh

These are separate letters in Croatian, not just spelling variants.

In Croatian, commands do not need an exclamation mark. A plain period is perfectly normal, especially in neutral instructions.

So:

• Pažljivo pročitaj šifru. = neutral instruction
• Pažljivo pročitaj šifru! = stronger, more urgent, or more emphatic

Both are correct. The version with a period sounds calm and instructional.