Zij koopt een roze jas.

It means she here.

The reason is the verb: koopt is singular, so it matches she, not they. If it meant they, the verb would be kopen:

• Zij koopt = she buys / she is buying
• Zij kopen = they buy / they are buying

So the verb form tells you which meaning is intended.

Both can mean she or they, but zij is the fuller, more stressed form, while ze is the shorter, unstressed form used a lot in everyday speech.

So all of these are possible:

• Zij koopt een roze jas.
• Ze koopt een roze jas.

In many situations, ze sounds more natural in casual spoken Dutch. Zij is often used for emphasis, contrast, or slightly more careful style.

Because Dutch verbs change according to the subject.

The infinitive is kopen = to buy.
With zij meaning she, you need the third person singular form:

• ik koop = I buy
• jij koopt = you buy
• hij/zij koopt = he/she buys
• wij kopen = we buy
• zij kopen = they buy

So zij koopt is the correct form for she buys.

It can mean either, depending on context.

Dutch often uses the simple present where English might use either:

• she buys
• she is buying

So Zij koopt een roze jas can describe a general action or something happening now, depending on the situation.

If Dutch wants to emphasize an action in progress, it can also use another structure, for example:

• Zij is een roze jas aan het kopen.

But the plain present tense is very common.

Een is the indefinite article, like English a or an.

So:

• een jas = a coat
• de jas = the coat

In this sentence, the speaker is talking about a pink coat, not a specific one already known to the listener, so een is the natural choice.

Also, een is usually unstressed when it means a/an. In speech, it often sounds more like uhn than like the number one.

Roze is the adjective pink, and it already ends in -e.

In Dutch, adjectives before nouns often take an -e ending. With a de-word like jas, that is exactly what you expect:

• de rode jas = the red coat
• een rode jas = a red coat

With roze, the adjective already has that form:

• een roze jas

So nothing extra has to be added. It is not rozee or anything like that.

Jas is a de-word:

• de jas = the coat

This matters because noun gender affects articles and adjective endings in Dutch.

For example:

• de jas
• een roze jas

With een, both de-words and het-words use the same indefinite article, so you do not see a difference in the article itself. But gender can still matter elsewhere in Dutch.

Yes. This is the basic word order for a simple main clause:

subject + finite verb + object

So:

• Zij = subject
• koopt = finite verb
• een roze jas = object

That gives:

• Zij koopt een roze jas.

A useful thing to know is that Dutch main clauses follow the verb-second rule. That means the finite verb usually comes second, even if something else comes first:

• Morgen koopt zij een roze jas.

Here morgen is first, so the verb koopt still stays in second position.

Yes, absolutely.

That is probably what you will hear most often in everyday speech. Zij koopt een roze jas is correct, but Ze koopt een roze jas is more casual and common.

Use zij when you want stress or contrast, for example:

• Zij koopt een roze jas, niet hij.

That means something like She is buying a pink coat, not he is.

Because it is the thing being bought.

In Zij koopt een roze jas:

• Zij does the action
• koopt is the action
• een roze jas receives the action

That makes een roze jas the direct object.

A quick way to test this is to ask: What is she buying?
Answer: een roze jas.