Chci zalepit duši novou záplatou.

Because Czech usually drops subject pronouns when they are not needed. The ending -i in chci already tells you it means I want.

• chci = I want
• já chci = I want with extra emphasis, contrast, or emotion

So the sentence without já is the normal neutral version.

After chtít (to want), Czech normally uses an infinitive for the second verb.

• chci zalepit = I want to patch / seal / glue up

This works like English want to do something.

This is about aspect, which is very important in Czech.

• lepit = imperfective, focusing on the process, repeated action, or ongoing action
• zalepit = perfective, focusing on finishing the action successfully

So:

• Chci lepit... can sound like I want to be gluing / I want to do some patching
• Chci zalepit... means I want to patch it up / get it sealed

In this sentence, the perfective zalepit is natural because the idea is to complete the repair.

The prefix za- often gives a sense of:

• covering something up
• closing or sealing something
• bringing an action to completion

So:

• lepit = to glue, to stick
• zalepit = to glue up, seal, patch over

In many verbs, prefixes also help create the perfective form.

Because it is in the accusative singular, since it is the direct object of zalepit.

The basic form is:

• duše = nominative singular

But after a transitive verb like zalepit, you need the object form:

• zalepit duši

So here:

• duše → duši in the accusative singular

Yes. Duše is a feminine noun.

That is why its forms look like this:

• nominative singular: duše
• accusative singular: duši

Its gender also affects agreement with adjectives in other contexts.

Because Czech uses the instrumental case here to show the means or tool: with a new patch.

So:

• nová záplata = nominative, basic dictionary form
• novou záplatou = instrumental singular

This answers the question with what?

• zalepit duši novou záplatou = patch the tube/soul with a new patch

Because Czech often uses the instrumental case without a preposition to express the means, instrument, or material.

This is very common:

• psát perem = write with a pen
• krájet nožem = cut with a knife
• zalepit záplatou = patch with a patch

So the meaning with a new patch is built directly into the instrumental form novou záplatou.

Because adjectives must agree with the nouns they describe in:

• gender
• number
• case

Here the noun záplata is:

• feminine
• singular
• instrumental

So the adjective nová must also become feminine singular instrumental:

• nová záplata → novou záplatou

Czech has no articles like English a/an/the.

So a noun on its own can mean:

• a patch
• the patch

depending on context.

That means duši and záplatou do not need extra words for definiteness. Context tells you how specific they are.

Yes. Czech word order is much more flexible than English word order.

The sentence:

• Chci zalepit duši novou záplatou.

is a normal, understandable version. But you could also hear things like:

• Duši chci zalepit novou záplatou.
• Chci duši zalepit novou záplatou.

The basic meaning stays similar, but the emphasis changes.

Very roughly:

• earlier position can highlight or contrast something
• the end of the sentence often carries important new information

Yes, chci is one of the harder Czech words for English speakers.

A rough pronunciation is:

• ch like the sound in Scottish loch or German Bach
• c like ts
• so chci is roughly kh-tsi

The whole sentence, very approximately, is:

• kh-tsi ZA-le-pit DOO-shi NO-voh ZAA-pla-toh

A few useful points:

• š sounds like English sh
• stress in Czech is normally on the first syllable of each word
• chci may feel awkward at first, but it becomes easier with practice

No. Duše can also mean inner tube.

So without context, the sentence could be understood either:

• literally, about repairing an inner tube
• metaphorically or poetically, about repairing a soul

If the intended meaning is the emotional or poetic one, then the sentence sounds figurative and expressive. If the intended meaning is the bicycle/tyre sense, then it can be completely practical and ordinary.

Yes, but the feeling depends on what duše means in context.

• If duše means inner tube, the sentence is practical and everyday.
• If duše means soul, the sentence sounds poetic, metaphorical, or lyrical.

So the grammar is normal either way, but the style changes with the meaning.