Test je lak.

Je means is. It is the 3rd person singular form of the verb biti (to be).

So:

• test = test / exam
• je = is
• lak = easy / light

In Serbian, je is a clitic, which means it is a short unstressed form that normally appears in the second position of the sentence.

Because lak is an adjective agreeing with test, and test is masculine singular.

In Serbian, adjectives must agree with the noun in gender, number, and case.

Here the noun is:

• test — masculine singular

So the adjective must also be masculine singular:

• lak — masculine singular
• laka — feminine singular
• lako — neuter singular

So:

• Test je lak. = The test is easy.
• Knjiga je laka. = The book is easy/light.
• Pitanje je lako. = The question is easy.

English learners often expect lako because English does not change easy, but Serbian does.

Test is masculine.

A useful clue is that many masculine nouns in Serbian appear in the dictionary or basic form with no ending:

• test
• grad
• pas
• student

This is not a perfect rule, but it is very common. Since test is masculine, the adjective must match it: lak.

It can mean both, depending on context.

Lak can mean:

• light in weight
• easy in difficulty

So:

• Kofer je lak. = The suitcase is light.
• Test je lak. = The test is easy.

Context tells you which meaning is intended.

Yes, you may hear lagan too, and it can also mean easy or light. But lak is very common and completely natural here.

There can be small differences in nuance depending on region and context:

• lak often feels like the basic, direct word
• lagan can sometimes sound a bit more descriptive or colloquial

For a learner, Test je lak. is a perfectly good sentence.

Because Serbian has no articles like English a/an/the.

So test can mean:

• a test
• the test

The exact meaning depends on context.

For example:

• Test je lak. could mean The test is easy or A test is easy, though in normal context the test is easy is usually the natural interpretation.

Serbian uses context, word order, and sometimes other words to show definiteness instead of articles.

Because the noun test is already the subject, so no extra pronoun is needed.

Serbian often leaves out subject pronouns unless they are needed for emphasis or clarity.

Here:

• Test = the subject
• je = is
• lak = easy

That is already complete.

You would not normally add a pronoun here.

Normally, Je test lak is not the standard neutral word order.

The usual sentence is:

• Test je lak.

This is because je is a clitic, and clitics usually go in the second position in the sentence.

So Serbian prefers:

• Test je lak.

You may see other word orders in special contexts, but for a basic statement, Test je lak is the form to learn.

A simple pronunciation guide is:

• Test ≈ test
• je ≈ ye
• lak ≈ lahk

A few notes:

• j in Serbian is like English y in yes
• a is a clear open vowel, like a in father
• Serbian spelling is very regular, so words are usually pronounced as written

So the whole sentence sounds roughly like:

test ye lahk

Both test and lak are in the nominative singular.

That is because test is the subject of the sentence, and predicate adjectives after to be match the subject.

So:

• test — nominative singular masculine
• lak — nominative singular masculine

This is one reason the adjective ends in -k here rather than taking some other ending.

Yes. Test je lak. is a complete, natural, grammatically correct Serbian sentence.

It is a very useful example because it shows several important features of Serbian:

• no articles
• adjective agreement
• the verb to be
• clitic position
• one form that can mean either light or easy depending on context

So it is short, but it teaches a lot.