To je rozhodně pravda.

Here, to is a demonstrative pronoun, and in this kind of sentence it often corresponds to that, this, or even it in English.

So To je... can mean:

• That is...
• This is...
• It is...

Which one sounds best in English depends on the context. In To je rozhodně pravda, it most naturally corresponds to That is definitely true or That’s definitely true.

Je is the 3rd person singular present tense of být (to be).

So:

• být = to be
• je = is

Czech normally keeps the verb to be in present-tense sentences like this, so To je pravda literally means That is truth.

Rozhodně is an adverb meaning:

• definitely
• certainly
• decidedly

It makes the statement stronger and more confident.

So:

• To je pravda. = That’s true.
• To je rozhodně pravda. = That’s definitely true.

A very common negative phrase is also rozhodně ne = definitely not.

This is just a very natural Czech pattern.

English often says:

• That’s true.

But Czech very commonly says:

• To je pravda.
• literally: That is truth

So although the grammar looks different from English, the meaning is the normal everyday equivalent of That’s true.

You may also see pravdivé (truthful / true), but To je pravda is much more idiomatic in ordinary conversation.

Pravda is in the nominative singular.

It is also the dictionary form of the noun:

• pravda = truth

In this sentence, it functions as the noun after je in a statement of identity or description:

• To je pravda. = That is true / That is the truth.

Also note that pravda is a feminine noun.

No, Czech word order is fairly flexible, but the given order is the most neutral and natural here:

• To je rozhodně pravda.

Changing the order can change the emphasis. For example:

• To je rozhodně pravda. = neutral, natural
• To rozhodně je pravda. = stronger emphasis on definitely
• Rozhodně je to pravda. = more marked or stylistic

For a learner, the original version is the safest one to use.

A rough English-friendly approximation is:

• ROZ-hod-nye

Helpful points:

• stress is on the first syllable
• ž sounds like the s in measure
• ně sounds roughly like nye

And je is pronounced roughly like:

• ye

So the whole sentence is approximately:

• to ye ROZ-hod-nye PRAV-da

That is only an approximation, but it is a useful starting point.

Yes. Very often, to je can mean:

• this is
• that is
• it is

Czech relies heavily on context here.

If you want to be more specific, Czech has forms like:

• tohle / toto = this
• tamto = that (over there)

But in everyday speech, plain to is extremely common.

Yes. Several adverbs can work here, with slightly different shades of meaning:

• To je určitě pravda. = That’s certainly / definitely true.
• To je opravdu pravda. = That’s really true.
• To je skutečně pravda. = That’s genuinely / truly true.

Compared with these:

• rozhodně often sounds firm and emphatic
• určitě is very common and everyday
• opravdu is like really
• skutečně can sound a bit more formal

Yes, but that is usually a different sentence pattern.

• Je pravda, že... = It is true that...

For example:

• Je pravda, že je unavený. = It is true that he is tired.

But as a short reaction meaning That’s true, Czech normally says:

• To je pravda.
• To je rozhodně pravda.

So if you are responding to something someone just said, the version with to is the most natural one.