De lovar snabb leverans om man använder rabattkoden på hemsidan.

No. In this sentence, man is the impersonal pronoun. It means something like one, you, or people in general.

So om man använder rabattkoden means if you use the discount code or if one uses the discount code.

It does not mean a man here.

Here, om means if.

Swedish om can mean different things depending on context:

• om = if
• om = about

In this sentence, it introduces a condition:

• De lovar snabb leverans om man använder rabattkoden på hemsidan.
• They promise fast delivery if you use the discount code on the website.

So this is the if meaning.

Because om man använder rabattkoden på hemsidan is a subordinate clause.

In Swedish subordinate clauses, the subject usually comes before the verb in normal order:

• om man använder
• if one uses

There is no main-clause inversion there.

Compare:

• Main clause: Man använder rabattkoden.
• Subordinate clause: ... om man använder rabattkoden.

If the om-clause comes first, then the main clause after it does invert:

• Om man använder rabattkoden på hemsidan, lovar de snabb leverans.

So the inversion happens in the main clause after a fronted subordinate clause, not inside the om-clause itself.

Because rabattkoden is the definite form, meaning the discount code.

The ending -en shows that this is a common-gender singular noun in the definite form:

• en rabattkod = a discount code
• rabattkoden = the discount code

The sentence suggests a specific code that the customer is expected to know about, for example one shown in an ad, email, or on the site.

Also, rabattkod is a compound noun:

• rabatt = discount
• kod = code
• rabattkod = discount code

Swedish normally uses på for websites and pages, just like English often uses on:

• på hemsidan = on the website
• på internet
• på Facebook

So på hemsidan is the natural choice here.

Also, hemsidan is definite:

• en hemsida = a website / webpage
• hemsidan = the website / the webpage

In everyday Swedish, hemsida is very common, even though more formal or technical Swedish may use webbplats for website.

Because leverans is a singular common-gender noun in the indefinite form.

Adjectives in Swedish agree with the noun:

• en snabb leverans = a fast delivery
• ett snabbt svar = a quick answer
• snabba leveranser = fast deliveries

Since leverans is an en-word and singular indefinite, the adjective takes the basic form:

• snabb leverans

If it were plural or definite, you would normally get snabba instead.

This is a very natural question, because English would usually say a fast delivery.

In Swedish, especially in advertising, business language, and general statements about a service, it is common to use a bare singular noun phrase without en:

• lova snabb leverans
• erbjuda fri frakt
• ge snabb service

This gives a more general, service-type meaning: they promise fast delivery as a feature.

You can also say en snabb leverans, but that sounds a little more concrete or individually countable. In marketing-style Swedish, the version without the article is very common.

De here means they.

It is the subject form:

• de = they
• dem = them

In everyday speech, many Swedes pronounce both de and dem as dom, even though the formal written forms are still de and dem.

So in normal speech, this sentence often sounds like:

• Dom lovar snabb leverans ...

But in standard writing, de is correct here because it is the subject.

Yes, it could, but the tone would change.

• om man använder rabattkoden = if one/you/people use the discount code
• om du använder rabattkoden = if you use the discount code

Using man sounds more general and impersonal. It is common in instructions, advertising, and statements about what applies in general.

Using du sounds more direct and addresses the reader personally.

Both are possible, but man is often chosen when the speaker wants a neutral, general tone.

Because lovar is followed here by a noun phrase, not by a full clause.

In the sentence:

• De lovar snabb leverans ...

the direct object is snabb leverans.

You use att when lova is followed by a clause:

• De lovar att leveransen blir snabb.
• They promise that the delivery will be fast.

So:

• lova + noun phrase → De lovar snabb leverans.
• lova + att-clause → De lovar att leveransen blir snabb.

Both patterns are correct; this sentence uses the first one.

In everyday Swedish, hemsida is often used to mean website in general, even though it can also literally mean homepage or web page depending on context.

So in this sentence, på hemsidan is best understood as on the website.

If someone wanted to be more precise or formal, they might say webbplatsen for the website. But hemsidan is extremely common in normal speech and writing.