Točkić i ručka su oštećeni.

Because the subject is compound: točkić i ručka = the wheel and the handle.

Even though each noun is singular by itself, together they form a plural subject, so Serbian uses the plural form of to be:

• je = is for one thing
• su = are for more than one thing

So:

• Točkić je oštećen. = The wheel is damaged.
• Ručka je oštećena. = The handle is damaged.
• Točkić i ručka su oštećeni. = The wheel and the handle are damaged.

Because točkić is masculine and ručka is feminine, and when Serbian has a mixed-gender plural subject, the adjective usually goes in the masculine plural form.

So:

• masculine singular: oštećen
• feminine singular: oštećena
• masculine plural: oštećeni
• feminine plural: oštećene
• neuter plural: oštećena

Here the subject is mixed:

• točkić = masculine
• ručka = feminine

So the standard agreement is:

• Točkić i ručka su oštećeni.

• točkić is masculine
• ručka is feminine

A useful clue is the ending:

• nouns ending in a consonant are often masculine: točkić
• nouns ending in -a are often feminine: ručka

That gender matters because it affects agreement:

• točkić je oštećen
• ručka je oštećena

They are in the nominative case, because they are the subject of the sentence.

The basic structure is:

• Točkić i ručka = subject
• su = verb
• oštećeni = predicate adjective / participle

So this is the normal subject form of both nouns.

In this sentence, it works like a predicate adjective meaning damaged.

Historically and grammatically, forms like oštećen / oštećena / oštećeni come from a passive participle, but in everyday learning it is often simplest to think of it as an adjective-like form that agrees with the subject.

That is why it changes form:

• točkić je oštećen
• ručka je oštećena
• točkić i ručka su oštećeni

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

The sentence:

• Točkić i ručka su oštećeni.

is a very natural, neutral order.

But you could also hear:

• Oštećeni su točkić i ručka.

That version puts more focus on the fact that they are damaged.

So the original sentence is normal and straightforward, but it is not the only possible order.

Because Serbian does not have articles like English a/an/the.

So a bare noun like točkić or ručka can mean:

• a wheel / the wheel
• a handle / the handle

The exact meaning depends on context.

That is completely normal in Serbian.

In standard Serbian, that would normally not be the expected form here.

Because the subject contains:

• one masculine noun: točkić
• one feminine noun: ručka

the usual agreement is masculine plural:

• oštećeni

You would use oštećene if the coordinated nouns were feminine plural in agreement, for example:

• Ručka i kutija su oštećene.

But with točkić + ručka, the standard form is:

• Točkić i ručka su oštećeni.

This word is useful because it contains both sounds:

• č = a harder ch sound, somewhat like ch in church
• ć = a softer sound; English does not have an exact equivalent

So točkić is roughly pronounced something like:

• TOCH-keech, with the last sound softer than a normal English ch

Also:

• ručka has č, the harder sound

Many learners do not fully master the č / ć difference at first, and that is normal.

Yes. The ending -ić often gives a diminutive or small-item feel.

So točkić often refers to a small wheel, little wheel, roller, or caster, depending on context.

That does not change the grammar of the sentence, but it can help explain why this word is used instead of a more general word for wheel.