Ujutro jedem tost s džemom i pijem čaj.

Ujutro is a fixed adverb meaning in the morning or morning-time. In this sentence, it tells you when the action happens.

So:

• Ujutro = in the morning
• jedem tost s džemom i pijem čaj = I eat toast with jam and drink tea

Croatian often uses this single-word adverb where English uses a prepositional phrase.

Croatian usually does not need the subject pronoun if the verb ending already shows who is doing the action.

Here:

• jedem = I eat
• pijem = I drink

The -em ending tells you the subject is I. So adding ja would usually be unnecessary unless you want emphasis:

• Ja ujutro jedem tost... = I eat toast in the morning... with extra stress on I

Jesti is the infinitive, meaning to eat.
Jedem is the 1st person singular present tense form, meaning I eat.

This verb changes its stem in the present tense:

• jesti = to eat
• jedem = I eat
• jedeš = you eat
• jede = he/she/it eats

So this is just a normal present-tense form you need to learn with the infinitive.

Again, piti is the infinitive (to drink), and pijem is the present tense form meaning I drink.

A few present forms are:

• piti = to drink
• pijem = I drink
• piješ = you drink
• pije = he/she/it drinks

So both verbs in the sentence are in the present tense, first person singular:

• jedem = I eat
• pijem = I drink

Tost is the direct object of jedem, so it is in the accusative case.

However, for many masculine inanimate singular nouns, the accusative looks the same as the nominative.

So:

• nominative: tost
• accusative: tost

That is why you see jedem tost and not a different form.

The preposition s meaning with normally takes the instrumental case.

The noun džem changes in the instrumental singular:

• nominative: džem
• instrumental: džemom

So:

• s džemom = with jam

This is one of the most important case patterns to remember:

• s + instrumental = with

Just like tost, čaj is a masculine inanimate singular noun, and here it is a direct object, so it is in the accusative.

For masculine inanimate nouns, nominative and accusative singular are often the same:

• nominative: čaj
• accusative: čaj

So:

• pijem čaj = I drink tea

Both s and sa mean with, but sa is usually used for easier pronunciation before certain sounds or consonant clusters.

For example, sa is common before words starting with:

• s
• š
• z
• ž
• or difficult clusters

In this sentence, s džemom is the normal form.

So:

• s džemom = standard here
• sa džemom would usually sound less natural in this specific sentence

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

This sentence starts with Ujutro to set the time first:

• Ujutro jedem tost s džemom i pijem čaj.

But you could also say:

• Jedem tost s džemom i pijem čaj ujutro.

Both are understandable. The difference is mostly about emphasis and style, not basic meaning.

Putting Ujutro first is very natural because it frames the whole sentence as a morning routine.

It can grammatically be present tense, but in this context it is most naturally understood as a habit or routine:

• In the morning, I eat toast with jam and drink tea.

Because ujutro often suggests a regular time pattern, the sentence sounds like something the speaker usually does.

If the context were different, present tense in Croatian could also describe something current, but here the habitual reading is the most likely.

I means and.

It connects two actions with the same subject:

• jedem tost s džemom = I eat toast with jam
• pijem čaj = I drink tea

Since both verbs are in the same person and tense, Croatian does not need to repeat the subject:

• Ujutro jedem tost s džemom i pijem čaj.
• literally: In the morning eat-I toast with jam and drink-I tea.

So i simply joins the two parts into one smooth sentence.