Jeden spinacz nie wystarczy do tego raportu, więc wezmę dwa.

Here spinacz means paperclip.

A few useful contrasts:

• spinacz = paperclip / clip
• zszywka = staple
• zszywacz = stapler

So this sentence is talking about clipping a report together, not stapling it.

Because spinacz is a masculine singular noun, and jeden has to agree with it.

For one, Polish changes form by gender:

• jeden = masculine
• jedna = feminine
• jedno = neuter

So:

• jeden spinacz = one paperclip
• jedna kartka = one sheet
• jedno biuro = one office

Here spinacz is masculine, so jeden is the correct form.

Because the subject is jeden spinacz — one paperclip.

So the verb agrees with that singular subject:

• Jeden spinacz nie wystarczy = one paperclip won’t be enough
• Dwa spinacze nie wystarczą = two paperclips won’t be enough

Singular subject → singular verb.

Wystarczy comes from the perfective verb wystarczyć. In Polish, perfective verbs often describe a single complete result.

Here the speaker is judging one specific situation:

• Is one paperclip enough for this report?
• No, it won’t be enough / isn’t enough.

That is why nie wystarczy sounds natural.

By contrast, wystarcza comes from the imperfective wystarczać and is more about a general or repeated situation, for example:

• Jeden spinacz zwykle wystarcza.
  One paperclip is usually enough.

So in this sentence, wystarczy fits better because it refers to one concrete case.

Because do is often used when something is meant for use with something else.

Here the meaning is basically:

• for this report
• for attaching/handling this report
• needed for this report

So spinacz do raportu means a paperclip intended for that report.

Dla usually means for the benefit of someone or something:

• prezent dla Anny = a present for Anna
• wiadomość dla kierownika = a message for the manager

A report is not really the beneficiary here, so dla would sound unnatural.

Because the preposition do requires the genitive case.

The basic form is:

• ten raport = this report

After do, both words change:

• do tego raportu = for/to this report

So:

• ten → tego
• raport → raportu

This is a very common pattern in Polish: a preposition forces a certain case, and the noun plus any matching words must change form.

Więc means so, therefore, or thus.

It connects the two ideas:

• one paperclip won’t be enough
• so I’ll take two

It is a very normal, neutral Polish linking word.

You could think of the sentence structure like this:

• X, więc Y = X, so Y

Wezmę means I will take.

It comes from the verb wziąć = to take, which is perfective.

So:

• wezmę = I will take / I’ll take

This is used because the speaker means one completed action: taking two paperclips right now as a decision.

Compare:

• biorę = I take / I’m taking
• wezmę = I’ll take
• będę brał / będę brała = I will be taking / I’ll take repeatedly or in a more imperfective sense

In this sentence, wezmę is the most natural choice.

Both are possible.

• wezmę dwa = I’ll take two
• wezmę dwa spinacze = I’ll take two paperclips

Polish often leaves out a noun when it is already obvious from context, just like English does.

Since the sentence already mentioned spinacz, there is no need to repeat it.

Because the omitted noun is spinacz, and spinacz is masculine.

With two, Polish distinguishes gender in some forms:

• dwa = used with masculine and neuter nouns
• dwie = used with feminine nouns

So:

• dwa spinacze = two paperclips
• dwie kartki = two sheets of paper

Even when the noun is omitted, the number still agrees with the understood noun. Since the hidden noun is spinacze, the sentence uses dwa.

No, Polish word order is fairly flexible, but this version sounds neutral and natural:

• Jeden spinacz nie wystarczy do tego raportu, więc wezmę dwa.

You can move things around for emphasis, for example:

• Do tego raportu jeden spinacz nie wystarczy...
  Emphasis on for this report
• ...więc dwa wezmę.
  Emphasis on two

But the original sentence is the most straightforward everyday order.