Ja pomažem majci sa ručkom.

Yes, it can be omitted. Serbian verbs usually show the subject clearly, and pomažem already means I help / I am helping, so Ja pomažem... and Pomažem... are both possible.

When ja is included, it often adds emphasis or contrast, as in I am helping, not someone else.

Pomažem is the 1st person singular present tense form of the verb pomagati, which is an imperfective verb.

That means it can describe:

• something happening now
• something you do regularly
• a general fact

So grammatically it is the I form of the present tense.

Because the verb pomagati takes the person being helped in the dative case.

So:

• majka = nominative
• majci = dative singular

The change from k to c is a normal sound change before -i in forms like this.

In Serbian, help someone is structured as pomagati nekome or pomoći nekome. That means the person receiving the help is put in the dative.

So English I help my mother becomes Serbian pomažem majci.

Because this part means with lunch. In Serbian, the preposition sa or s means with, and after it you use the instrumental case.

So:

• ručak = nominative
• sa ručkom = with lunch, using instrumental

This tells you what the help is connected with.

Ručkom is the instrumental singular of ručak.

The noun ručak changes its form in the oblique cases:

• ručak = nominative
• ručka = genitive
• ručku = dative
• ručkom = instrumental

So after sa, you get sa ručkom.

You may hear both, but sa ručkom is completely natural and a very safe choice for learners.

In real Serbian, speakers often choose sa when it sounds smoother or more natural in speech. So in this sentence, sa ručkom is perfectly fine and very common.

Yes. Pomažem comes from pomagati, which is imperfective.

The perfective partner is pomoći. Its present-tense form is different, for example pomognem.

In this sentence, the imperfective is used because it fits a present ongoing or habitual meaning better.

Yes. Serbian word order is fairly flexible.

For example, all of these are possible depending on emphasis:

• Ja pomažem majci sa ručkom.
• Pomažem majci sa ručkom.
• Majci pomažem sa ručkom.

The most neutral version often omits ja unless you want emphasis.

It can mean either, depending on context.

Because pomažem is present tense of an imperfective verb, it can mean:

• I am helping my mother with lunch right now
• I help my mother with lunch in general or regularly

Context tells you which meaning is intended.

Serbian often leaves possession unstated when it is obvious from context, especially with family members.

So majci can naturally mean my mother if that is already understood. If you want to say it explicitly, you could say mojoj majci.

Yes. A very common alternative is Pomažem majci oko ručka.

Both are natural, but they feel slightly different:

• sa ručkom = helping with lunch
• oko ručka = helping around lunch / with the lunch-related tasks

In many everyday situations, either one works well.