Jeg vælger bomuld om sommeren, men min veninde vælger uld om vinteren.

No. In Danish, verbs do not change for different persons the way they do in English.

So:

• jeg vælger = I choose
• du vælger = you choose
• han/hun vælger = he/she chooses
• vi vælger = we choose

The form vælger is the present tense and stays the same for all subjects.

Because bomuld and uld are being used as materials in a general sense: cotton and wool.

In Danish, as in English, materials are often used without an article when you mean them generally:

• Jeg vælger bomuld = I choose cotton
• Hun foretrækker silke = She prefers silk

You would only add an article if you were talking about a specific piece, type, or amount in a different context.

Om sommeren means in the summer or during the summer.

In Danish, when talking about the seasons in a general time-expression, it is very common to use:

• om sommeren = in summer / in the summer
• om vinteren = in winter / in the winter
• om foråret = in spring
• om efteråret = in autumn

Notice that the season is in the definite form:

• sommeren = the summer
• vinteren = the winter

This is the normal idiomatic pattern after om when talking about time of year in general.

Yes, om can mean about, but it has several uses in Danish.

In this sentence, om means during / in when talking about recurring time periods:

• om sommeren = during the summer
• om vinteren = during the winter

So om is not always about. Its meaning depends on context.

Veninde specifically means female friend.

Compare:

• ven = male friend, or sometimes just friend in a general sense
• veninde = female friend

So min veninde means my female friend.

This is useful because Danish often makes this distinction more clearly than English does.

Min veninde is the normal way to say my female friend.

In Danish, possessives like min, din, hans, hendes usually come before the noun:

• min veninde = my female friend
• min bog = my book
• min bil = my car

So the structure is simply:

possessive + noun

Because each main clause in Danish needs its own finite verb.

The sentence has two clauses joined by men:

• Jeg vælger bomuld om sommeren
• men min veninde vælger uld om vinteren

In English, we also normally repeat the verb here:
I choose cotton in summer, but my friend chooses wool in winter.

Danish does not usually omit the verb in this kind of sentence.

No. Men means but and is a coordinating conjunction. It connects two main clauses.

After men, the next clause keeps normal main-clause word order:

• men min veninde vælger uld om vinteren

That is:

1. subject = min veninde
2. verb = vælger

So there is no special inversion here just because of men.

Yes, absolutely.

Both are correct:

• Jeg vælger bomuld om sommeren
• Om sommeren vælger jeg bomuld

The difference is emphasis.

If you start with Om sommeren, then Danish uses verb-second word order, so the verb comes before the subject:

• Om sommeren vælger jeg bomuld

Not:

• Om sommeren jeg vælger bomuld ❌

This is a very important Danish word-order rule.

A helpful way to break it down is:

• Jeg = subject
• vælger = verb
• bomuld = object
• om sommeren = time expression

Then:

• men = but

And the second clause follows the same pattern:

• min veninde = subject
• vælger = verb
• uld = object
• om vinteren = time expression

So the basic pattern is:

Subject + verb + object + time

That is a very common Danish sentence structure.

A learner may notice that these words are not pronounced exactly the way they look.

A rough guide:

• vælger sounds approximately like VEL-yer
• bomuld sounds roughly like BO-mool or BO-multh depending on accent and reduction
• uld sounds somewhat like ool with a soft ending
• veninde sounds roughly like veh-NIN-de

A few pronunciation points:

• æ is a front vowel, somewhat like the vowel in bed, but not identical.
• g in vælger is soft here.
• Unstressed syllables in Danish are often reduced.
• Final consonants can sound softer or different from what an English speaker expects.

If you are learning pronunciation, it is especially worth listening carefully to native audio for vælger and uld.

Yes. The present tense in Danish often expresses a general habit or usual preference.

So this sentence naturally means something like:

• I choose cotton in summer
• but my friend chooses wool in winter

This sounds like a general pattern or preference, not necessarily something happening right now.

That is very normal in Danish.