Muszę poprawić ten raport przed spotkaniem.

In Polish, the verb ending usually shows who the subject is, so the pronoun is often omitted.

Muszę already means I must / I have to, so ja is unnecessary. You could say Ja muszę poprawić ten raport przed spotkaniem, but that adds emphasis, as if you are contrasting yourself with someone else.

Muszę means I must, I have to, or I need to.

Its dictionary form is musieć.

A few forms are:

• muszę – I must
• musisz – you must
• musi – he/she/it must
• musimy – we must

So in this sentence, muszę is first person singular, present tense.

After muszę, Polish normally uses an infinitive, just like English often does after must or have to.

So:

• muszę poprawić = I have to correct / improve
• muszę iść = I have to go
• muszę pracować = I have to work

This is a very common structure: musieć + infinitive

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

• poprawić is perfective
• poprawiać is imperfective

In this sentence, poprawić is used because the speaker means they need to finish correcting/improving the report before the meeting.

So:

• Muszę poprawić ten raport przed spotkaniem
  = I need to correct/fix it completely before the meeting.

If you said muszę poprawiać, it would sound more like:

• I have to be correcting it
• I have to work on correcting it
• repeated or ongoing action

That is less natural here if the focus is on getting the report done before the meeting.

It can mean all of those, depending on context.

With raport, poprawić often means:

• correct
• revise
• improve
• fix up

So the sentence could imply:

• correcting mistakes in the report
• improving the quality of the report
• revising the report before presenting it

Polish poprawić is a little broader than just one English word.

Literally, ten means this.

But Polish has no articles, so words like ten can sometimes feel closer to English this, and in some contexts they also help mark something as specific, almost like the.

So ten raport can mean:

• this report
• sometimes, in context, something like the report we both know about

Still, the basic literal meaning of ten is this.

Because ten must agree with raport in gender, number, and case.

Raport is a masculine singular noun, so the correct demonstrative form is ten.

Compare:

• ten raport – this report
• ta książka – this book
• to spotkanie – this meeting

So to raport would be wrong here.

It actually is the direct object, so it is in the accusative case. But for many masculine inanimate nouns, the accusative singular looks exactly the same as the nominative singular.

So:

• nominative: ten raport
• accusative: ten raport

No visible change happens.

If the noun were feminine, you would usually see a clearer change. For example:

• ta książka – nominative
• poprawić tę książkę – accusative

So raport is in the correct case; it just happens to look unchanged.

After the preposition przed, Polish uses the instrumental case.

The noun spotkanie is a neuter noun, and its instrumental singular form is spotkaniem.

So:

• spotkanie – meeting
• przed spotkaniem – before the meeting

This is a very common pattern:

• przed obiadem – before lunch
• przed lekcją – before class
• przed wyjazdem – before the trip / departure

So the ending -em in spotkaniem shows instrumental singular.

Yes. Polish word order is more flexible than English because the case endings show grammatical relationships.

The original sentence is neutral and natural:

• Muszę poprawić ten raport przed spotkaniem.

But you could also say:

• Ten raport muszę poprawić przed spotkaniem.
  Emphasizes this report.

• Przed spotkaniem muszę poprawić ten raport.
  Emphasizes before the meeting.

• Muszę ten raport poprawić przed spotkaniem.
  Also possible, though the rhythm and emphasis are slightly different.

So the meaning stays similar, but the focus can shift.

A rough pronunciation guide:

• Muszę ≈ MOO-sheh
• poprawić ≈ po-PRA-veech
• ten raport ≈ ten RAW-port
• przed spotkaniem ≈ pshet spot-KA-nyem

A few helpful notes:

• sz sounds like English sh
• ć sounds like a soft ch / tch sound
• rz in przed sounds like zh, but after p here the whole cluster is pronounced more like psh
• Polish stress is usually on the second-to-last syllable:
  • MU-szę
  • po-PRA-wić
  • spo-TKA-niem

You do not need to pronounce every letter exactly like English spelling would suggest. Polish spelling is fairly regular once you learn the sound patterns.