Pas večeras čudno laje.

• Pas = dog
• večeras = tonight / this evening
• čudno = strangely / oddly
• laje = is barking / barks

So the sentence is literally something like: Dog tonight strangely barks, which in natural English becomes The dog is barking strangely tonight or The dog barks strangely tonight.

Pas is the singular nominative form, used here because the dog is the subject of the sentence.

A few related forms:

• pas = dog (singular, subject form)
• psa = dog (singular, often object/genitive form)
• psi = dogs (plural)

Since only one dog is doing the action, pas is the correct form.

Laje is the 3rd person singular present tense of the verb lajati = to bark.

So:

• ja lajem = I bark
• ti laješ = you bark
• on/ona/ono laje = he/she/it barks

Because pas is singular, the verb must also be singular: pas laje = the dog barks / is barking.

Croatian does not form the present continuous in the same way English does. The simple present laje can often mean both:

• barks
• is barking

The exact meaning depends on context. In this sentence, English will often naturally translate it as is barking strangely tonight, but Croatian simply uses the present tense laje.

Večeras is an adverb of time, meaning tonight or this evening.

It tells you when the barking happens.

Compare:

• danas = today
• sutra = tomorrow
• sinoć = last night
• večeras = tonight

It does not change for case, gender, or number here.

Čudno is an adverb, meaning strangely, oddly, or in a strange way.

It comes from the adjective čudan = strange.

Compare:

• čudan pas = a strange dog
  Here čudan describes the noun pas.
• pas čudno laje = the dog barks strangely
  Here čudno describes the verb laje.

So čudan is an adjective, while čudno is the adverb form.

Croatian does not have articles like English a and the.

So pas can mean:

• a dog
• the dog

You understand which one is meant from context. In this sentence, English will often use the dog, but Croatian simply says pas.

No, Croatian word order is fairly flexible. Pas večeras čudno laje is natural, but other orders are also possible, depending on emphasis.

For example:

• Pas večeras čudno laje. = neutral
• Večeras pas čudno laje. = emphasis on tonight
• Čudno pas večeras laje. = stronger emphasis on strangely; less neutral

Because Croatian uses case endings and verb forms, word order can shift more freely than in English. Still, some orders sound more natural than others.

Yes. Večeras can correspond to both this evening and tonight, depending on context.

So the sentence could mean:

• The dog is barking strangely tonight
• The dog is barking strangely this evening

English chooses between those based on context and style.

A rough pronunciation guide for an English speaker:

• Pas ≈ pahs
• večeras ≈ VE-cheh-rahs
• čudno ≈ CHOOD-no
• laje ≈ LAH-yeh

A few useful sound notes:

• č sounds roughly like ch in church
• j sounds like y in yes
• Croatian vowels are usually clear and short: a, e, i, o, u

So laje is not like English layj; it is closer to LAH-yeh.

Yes, that is also possible and understandable.

• Pas večeras čudno laje sounds quite natural.
• Pas čudno laje večeras also works, with večeras placed later.

Both mean essentially the same thing. The difference is mostly about rhythm and emphasis, not basic meaning.

Lajati is imperfective.

That makes sense because barking is usually seen as an ongoing or repeated action:

• Pas laje. = The dog is barking / barks.

Croatian often uses imperfective verbs for actions in progress, habitual actions, or general descriptions. In a sentence like this, that is exactly what you want.

It can do either, depending on context.

• right now / this evening: The dog is barking strangely tonight
• general situation for tonight: The dog barks strangely tonight

In real use, with večeras, many speakers will understand it as something happening in the current evening context. Croatian present tense often covers both the English simple present and present continuous.