Ti misliš da je odgovor dobar.

Yes. Serbian often drops subject pronouns because the verb ending already shows who the subject is.

• misliš = you think (singular, informal)

So Ti misliš da je odgovor dobar. and Misliš da je odgovor dobar. can both mean You think that the answer is good.

Including ti usually does one of these things:

• adds emphasis
• adds contrast
• makes the subject especially clear

For example:

• Ti misliš da je odgovor dobar, a ja ne. = You think the answer is good, but I don’t.

So ti is not required, but it is perfectly natural.

Misliš is the 2nd person singular present tense of the verb misliti = to think.

Present tense forms of misliti:

• ja mislim = I think
• ti misliš = you think
• on/ona/ono misli = he/she/it thinks
• mi mislimo = we think
• vi mislite = you think / you all think / you formal think
• oni/one/ona misle = they think

So in this sentence:

• Ti misliš = You think

In Serbian, da often introduces a clause like English that.

So:

• Ti misliš da... = You think that...

The full sentence is structured like this:

• Ti misliš = You think
• da je odgovor dobar = that the answer is good

In everyday English, that is often omitted:

• You think the answer is good.

But in Serbian, da is normally kept in this kind of sentence.

This is because je is a clitic in Serbian. Clitics are short unstressed words that usually go in the second position of their clause.

In the clause:

• da je odgovor dobar

the conjunction da comes first, and the clitic je comes immediately after it.

So this word order is natural:

• da je odgovor dobar

not usually:

• da odgovor je dobar

This is a very important Serbian pattern. You will see it with other clitics too.

Compare:

• Mislim da je u pravu. = I think that he/she is right.
• Znam da ga voli. = I know that she loves him.

Je is the 3rd person singular present tense of biti = to be.

Here it means is:

• odgovor je dobar = the answer is good

Inside the da-clause, it appears as:

• da je odgovor dobar = that the answer is good

So je is just the verb is.

Here odgovor stays in the nominative singular because it is the subject of the clause:

• odgovor je dobar = the answer is good

In that clause:

• odgovor = subject
• je = is
• dobar = good

Since odgovor is the subject, it does not need accusative or another case here.

Because dobar must agree with odgovor.

The noun odgovor is:

• masculine
• singular
• nominative

So the adjective must also be:

• masculine
• singular
• nominative

That gives:

• dobar

Compare:

• odgovor → dobar odgovor / odgovor je dobar
• knjiga (feminine) → dobra knjiga / knjiga je dobra
• pitanje (neuter) → dobro pitanje / pitanje je dobro

Normally, no. In Serbian, after verbs like misliti, you usually keep da before a full clause.

So Serbian naturally says:

• Misliš da je odgovor dobar.

Not usually:

• Misliš je odgovor dobar.

English can say both:

• You think that the answer is good.
• You think the answer is good.

Serbian generally needs da here.

The basic meaning is the same.

The difference is mostly in emphasis:

• Misliš da je odgovor dobar. = neutral, very natural
• Ti misliš da je odgovor dobar. = you think the answer is good

That second version can sound like:

• emphasis on you
• contrast with someone else’s opinion
• clarification of who is being addressed

So the pronoun adds focus rather than changing the core meaning.

Yes, Serbian word order is fairly flexible, but not all orders sound equally natural.

The most neutral form here is:

• Ti misliš da je odgovor dobar.

You may also hear variations for emphasis, such as:

• Misliš da je odgovor dobar.
• Da je odgovor dobar, ti misliš. — possible, but marked and stylistic
• Odgovor je dobar, ti misliš. — also marked, and sounds like a special discourse pattern

However, inside the subordinate clause, the position of je is still restricted because it is a clitic. So:

• da je odgovor dobar is natural
• da odgovor je dobar is not the normal choice

Yes. Ti is you for:

• one person
• informal use

If you want formal singular or plural you, Serbian uses vi, and the verb changes too:

• Ti misliš da je odgovor dobar. = informal singular
• Vi mislite da je odgovor dobar. = formal singular or plural

So misliš goes with ti, while mislite goes with vi.

Yes. In this sentence, misliti means to think / believe / be of the opinion that.

So:

• Ti misliš da je odgovor dobar. = You think the answer is good.

It is about an opinion or judgment.

This is different from some other uses of think in English, such as:

• think about = misliti o
• think of someone/something = often misliti na or pomisliti na, depending on meaning

But in your sentence, it is simply to think that... = misliti da...