Da li ti ovaj plan odgovara?

Da li is a very common way to form a yes/no question in Serbian.

So:

• Ovaj plan ti odgovara. = This plan suits you / works for you.
• Da li ti ovaj plan odgovara? = Does this plan suit you / work for you?

It does not change the basic meaning of the sentence; it just turns it into a question.

Ti is the dative form of you in the singular informal sense.

The verb odgovarati in this meaning is used like:

• odgovarati nekome = to suit someone / to be convenient for someone

So:

• ovaj plan = the thing that suits
• ti = the person it suits

Literally, the structure is closer to:

• Does this plan suit to you?

Natural English does not say that, but Serbian uses the dative here.

Compare:

• Meni odgovara. = It suits me / It works for me.
• Tebi odgovara. = It suits you.
• Njemu odgovara. = It suits him.

Because odgovara is the 3rd person singular present tense of odgovarati.

Here, the subject is ovaj plan, which is singular, so the verb must also be singular:

• ovaj plan odgovara

Also, odgovarati and odgovoriti are related but not identical in use:

• odgovarati can mean to suit, to correspond, or to answer in an ongoing/general sense
• odgovoriti is usually the perfective verb meaning to answer once, completely

In this sentence, the meaning is to suit / to work for someone, so odgovara is the natural form.

Because ovaj plan is the subject of the sentence.

It is the thing that does the suiting:

• This plan suits you.

So Serbian treats ovaj plan as the subject, and subjects normally appear in the nominative.

Breaking it down:

• ovaj = this
• plan = plan
• together: this plan

Both words are masculine singular nominative here.

No. That is a very common source of confusion.

Odgovarati can mean several things depending on context, including:

• to answer
• to suit
• to be convenient
• to correspond / match

In Da li ti ovaj plan odgovara?, it means:

• Does this plan suit you?
• Does this plan work for you?
• Is this plan convenient for you?

So you should not automatically translate odgovara as answers.

Yes. Serbian word order is fairly flexible.

You may hear:

• Da li ti ovaj plan odgovara?
• Da li ovaj plan ti odgovara?
• Da li ti odgovara ovaj plan?
• Odgovara li ti ovaj plan?

These all mean roughly the same thing, but the emphasis can shift slightly.

The version you were given is very natural and neutral.

A very common alternative is:

• Da li ti odgovara ovaj plan?

This often sounds especially natural in everyday speech.

Yes.

Another standard way to ask a yes/no question is to put li after the verb:

• Odgovara li ti ovaj plan?

This is a bit more compact and is also fully correct.

In conversation, people often prefer da li because it feels straightforward and common:

• Da li ti ovaj plan odgovara?

Both are normal Serbian.

Yes. Ti is the informal singular form, used with:

• friends
• family
• children
• people you know well
• peers in informal situations

The formal or plural version uses vam:

• Da li vam ovaj plan odgovara?

That can mean either:

• Does this plan suit you? (formal singular)
• Does this plan suit you all? (plural)

So the sentence with ti is specifically informal singular.

Yes, if the context already makes it clear who is being talked about.

For example:

• Da li ovaj plan odgovara?

However, without ti, the sentence may sound less complete unless the listener already knows for whom the plan is supposed to work.

In most real situations, keeping ti is natural and helpful:

• Da li ti ovaj plan odgovara?

Common answers include:

• Da, odgovara mi. = Yes, it works for me.
• Da, odgovara. = Yes, it does.
• Ne, ne odgovara mi. = No, it doesn't work for me.
• Ne baš. = Not really.
• Može. = That works / Okay.

Notice the dative again:

• mi = to me
• ti = to you

So:

• odgovara mi = it suits me
• odgovara ti = it suits you

These are different demonstratives:

• ovaj = this (near the speaker, or mentally close)
• taj = that (near the listener, or already mentioned)
• onaj = that over there / that one yonder

So:

• ovaj plan = this plan
• taj plan = that plan
• onaj plan = that plan over there / that other plan

In your sentence, ovaj plan simply means the speaker is referring to this plan.

Ovaj is:

• masculine
• singular
• nominative

It agrees with plan, which is also masculine singular nominative.

So:

• ovaj plan = masculine singular nominative
• if the noun changed, the form of the demonstrative would change too

For example:

• ova ideja = this idea (feminine)
• ovo pitanje = this question (neuter)

This agreement is an important feature of Serbian grammar.

By itself, it is closer to:

• Does this plan suit you?
• Does this plan work for you?
• Is this plan convenient for you?

It usually focuses on practicality, convenience, or personal suitability.

If you wanted to ask more specifically whether someone agrees with the plan, Serbian might use a different wording depending on context.

So it is best not to treat odgovara here as a pure agree verb. It is more about whether the plan is acceptable, convenient, or suitable for the person.