Hun er grundig, når hun læser kontrakten, men jeg bliver sjusket, hvis jeg bare vil være færdig.

They are related, but they do different jobs here:

• er = is/am/are
  
  • Hun er grundig = She is thorough/careful
• bliver = becomes/gets
  
  • jeg bliver sjusket = I become/get sloppy

So the sentence contrasts:

• her usual quality: She is thorough
• my change of state: I get sloppy

This is a very common Danish difference:

• Han er træt = He is tired
• Han bliver træt = He gets tired

Grundig means thorough, careful, or meticulous.

In this sentence, Hun er grundig, når hun læser kontrakten means she reads the contract carefully and pays attention to details.

It is stronger than just careful in some contexts; it suggests doing something properly and completely.

Sjusket means sloppy, careless, or messy in the way something is done.

So:

• jeg bliver sjusket = I get sloppy / I become careless

It often describes poor attention to detail, especially when someone is rushing.

Related noun:

• sjusk = sloppiness

Because kontrakten is the definite form: the contract.

Danish often adds the definite ending to the noun itself:

• en kontrakt = a contract
• kontrakten = the contract

So hun læser kontrakten means she is reading the contract / she reads the contract, referring to a specific contract.

This is a very important distinction.

• når = when, often for something that really happens, usually repeatedly or generally
• hvis = if, for a condition

In the sentence:

• Hun er grundig, når hun læser kontrakten
  = She is thorough when she reads the contract
  This suggests a general pattern or repeated situation.

• jeg bliver sjusket, hvis jeg bare vil være færdig
  = I get sloppy if I just want to be finished
  This expresses a condition: when that attitude is present, the result is sloppiness.

A learner should be careful not to use hvis where Danish wants når for repeated/general when.

Because in Danish subordinate clauses, words like bare often come before the finite verb.

So in the subordinate clause:

• hvis jeg bare vil være færdig

the order is:

• hvis = if
• jeg = subject
• bare = adverb
• vil = finite verb
• være færdig = be finished/done

This is normal subordinate clause word order in Danish.

Compare:

• Main clause: Jeg vil bare være færdig
• Subordinate clause: ... hvis jeg bare vil være færdig

In this particular case, the word order looks similar in English, but the Danish system becomes especially noticeable with other adverbs like ikke:

• Main clause: Jeg vil ikke gå
• Subordinate clause: ... hvis jeg ikke vil gå

Læser is the present tense.

Danish present tense often covers both:

• reads
• is reading

Which one is meant depends on context.

Here, because of når and the overall meaning, it is most naturally understood as a general/habitual action:

• when she reads the contract
• or more naturally in English, when she’s reading the contract

Danish does not usually force the same simple vs. continuous distinction that English does.

Because after a modal verb like vil (want to / will), Danish normally uses the infinitive without at.

So:

• vil være = want to be / will be
• not vil at være

This is like other modal verbs:

• kan læse = can read
• skal gå = must go / have to go
• må tage = may take / must take

So jeg bare vil være færdig is completely normal.

Være færdig means to be finished, to be done, or to be through with something.

In this sentence, jeg bare vil være færdig means something like:

• I just want to be done
• I just want to get it over with
• I just want to finish

It suggests impatience or a desire to finish quickly, which explains why the speaker then becomes sjusket.

Because færdig is a predicative adjective agreeing with the understood subject jeg.

With jeg, you normally use the basic singular form:

• Jeg er færdig = I am finished
• Jeg bliver færdig i morgen = I’ll be finished tomorrow

You would see -t with a neuter singular noun:

• Arbejdet er færdigt = The work is finished

And -e in plural:

• Vi er færdige = We are finished

Danish punctuation normally uses commas to mark clause boundaries quite clearly.

In this sentence:

• Hun er grundig, når hun læser kontrakten, men jeg bliver sjusket, hvis jeg bare vil være færdig.

you have:

1. Main clause: Hun er grundig
2. Subordinate clause: når hun læser kontrakten
3. Main clause introduced by men: men jeg bliver sjusket
4. Subordinate clause: hvis jeg bare vil være færdig

So the commas help separate those units.

You do not need to think of this as exactly the same as English comma usage; Danish comma rules are more clause-based.

Yes. Men is the standard Danish word for but.

It connects two contrasting statements:

• Hun er grundig ...
• men jeg bliver sjusket ...

So the contrast is between her careful way of working and the speaker’s tendency to get sloppy under pressure.

Yes. In fact, that is the most natural reading.

Because of når plus the present tense, the sentence sounds like a general truth or habitual behavior:

• Whenever she reads the contract, she is thorough

It does not mainly describe a single moment right now. It describes how she typically behaves in that situation.

Yes. Here bare means just in the sense of simply / merely.

• hvis jeg bare vil være færdig = if I just want to be done

It implies that the speaker is focusing only on finishing quickly, not on doing the job carefully.

Be aware that bare can have several meanings in Danish depending on context, including:

• just
• only
• simply
• sometimes go ahead / feel free in commands

But here just/simply is the best fit.