Toto je moje povinnost.

Toto means this. It is a demonstrative pronoun, and here it is the subject of the sentence.

It is different from to in that toto is more explicitly this, while to can mean it, that, or sometimes this, depending on context.

In everyday spoken Czech, many speakers would more often say:

• Tohle je moje povinnost.
• To je moje povinnost.

So toto is completely correct, but it can sound a bit more formal, emphatic, or regionally marked than tohle or to.

Je is the 3rd person singular present tense of být, which means to be.

Because toto is singular, Czech uses je = is.

A few forms of být are:

• jsem = am
• jsi = are
• je = is

So Toto je... literally matches This is...

Because Czech possessive pronouns change their form to match the noun they describe in gender, number, and case.

The noun povinnost is:

• feminine
• singular
• nominative here

So my appears as moje.

Compare:

• můj dům = my house
• moje kniha = my book
• moje auto = my car

So in moje povinnost, the form moje agrees with the feminine noun povinnost.

In Czech, noun gender is not determined only by the last letter. While many feminine nouns do end in -a, quite a few feminine nouns end in a consonant.

This is especially common with abstract nouns ending in -ost.

For example:

• radost = joy
• možnost = possibility
• povinnost = duty / obligation

All of these are feminine.

Here povinnost is in the nominative singular.

In this sentence, moje povinnost is the predicate noun phrase after je and identifies what toto is. In this kind of sentence, nominative is the natural form:

• Toto = nominative
• je = is
• moje povinnost = nominative

So the sentence structure is basically This is my duty.

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

Czech simply says:

• moje povinnost

and the exact meaning depends on context. In English, you need an article, but in Czech you usually do not.

So Czech speakers understand from context whether something is a duty, the duty, or just duty in a general sense.

Toto je moje povinnost is the most neutral word order.

Czech word order is more flexible than English, so other versions are possible, but they change the emphasis a bit.

For example:

• Toto je moje povinnost. = neutral
• To je moje povinnost. = very common
• Tohle je moje povinnost. = common spoken version with this
• Moje povinnost je toto. = possible, but strongly marked and unusual in normal conversation

So yes, Czech allows variation, but this version is the safest basic pattern to learn.

A simple pronunciation guide is:

TO-to ye MO-ye PO-vin-nost

A few useful points:

• Czech stress usually falls on the first syllable of the word.
• j is pronounced like English y in yes.
• je sounds roughly like ye.
• moje sounds like MO-ye.
• povinnost has stress on PO.

So the whole sentence flows roughly as:

TO-to ye MO-ye PO-vin-nost