D i ja učimo hrvatski zajedno.

It may be, but only in a special case.

• If D is an abbreviation or initial for someone’s name, then D i ja can mean D and I. In more careful writing, you would usually write the initial with a period: D. i ja.
• If the intended meaning is you and I, then this is probably a typo, and the normal Croatian would be Ti i ja učimo hrvatski zajedno.

So an English-speaking learner would usually expect ti i ja, not D i ja.

Učimo is the 1st person plural present tense of učiti, meaning to learn or to study.

The ending -mo shows we.

A few forms of učiti are:

• učim = I learn / am learning
• učiš = you learn / are learning
• uči = he/she learns / is learning
• učimo = we learn / are learning
• učite = you all learn / are learning
• uče = they learn / are learning

Because a subject like ti i ja or D. i ja counts as we.

In Croatian, when two people are joined by i meaning and, the verb normally becomes plural:

• Ti i ja učimo = You and I learn
• Ana i ja učimo = Ana and I learn

So even though ja means I, the whole subject is plural.

It can mean both, depending on context.

Croatian present tense often covers both:

• we learn
• we are learning

So učimo hrvatski zajedno can mean either:

• We learn Croatian together
  or
• We are learning Croatian together

If the situation makes it clear that the action is happening now, English often uses are learning, but Croatian does not need a separate form for that here.

Because in Croatian, names of languages are normally not capitalized.

So:

• hrvatski = Croatian
• engleski = English
• njemački = German

This is different from English, where language names are capitalized.

You would only capitalize Hrvatski if it came at the beginning of a sentence or was part of a title.

Here, hrvatski means the Croatian language.

It is originally an adjective, but Croatian often uses language adjectives as nouns:

• hrvatski = Croatian
• engleski = English
• francuski = French

In this sentence, it is the direct object of učimo. That means it is in the accusative case. But for many masculine inanimate words, the accusative singular looks the same as the nominative singular.

So even though it is functioning as an object, the form still appears as hrvatski.

Zajedno means together.

It is an adverb, and it describes how the action is done: the learning happens together.

It is at the end because that is a very natural place for it, but Croatian word order is fairly flexible. You could also say:

• Ti i ja zajedno učimo hrvatski.
• Zajedno učimo hrvatski.
• Hrvatski učimo zajedno.

The meaning stays very similar, although the emphasis changes a little.

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

The basic sentence is natural as:

• Ti i ja učimo hrvatski zajedno.

But you can also hear:

• Ti i ja zajedno učimo hrvatski.
• Zajedno učimo hrvatski.
• Hrvatski učimo zajedno.

Croatian uses endings and context more than English does, so changing the order often changes emphasis, not the core meaning.

Yes, often it can.

Because učimo already tells you the subject is we, Croatian frequently drops the pronoun:

• Učimo hrvatski zajedno.

That already means We are learning Croatian together.

However, if you specifically want to say you and I, then keeping ti i ja is useful, because it tells the listener exactly who we are.

Usually, yes.

Just like English often prefers you and I rather than I and you, Croatian often sounds more natural with:

• ti i ja

rather than:

• ja i ti

Both are understandable, but ti i ja is often the more usual and polite order.

A rough pronunciation guide is:

• učimo ≈ OO-chee-mo
• hrvatski ≈ HR-vat-skee
• zajedno ≈ za-YED-no

A few useful sound notes:

• č sounds like ch in church
• j sounds like y in yes
• h is pronounced, unlike in many English words
• the r in hrvatski is a real Croatian r, usually tapped or rolled lightly

The cluster hrv- can feel difficult for English speakers at first, but it gets easier with practice.