Hvis stavekontrollen foreslår noget mærkeligt, stoler jeg ikke altid på den.

Hvis means if and introduces a conditional clause.

So:

• Hvis stavekontrollen foreslår noget mærkeligt = If the spell-check suggests something strange

This first part sets up the condition for the main clause:

• stoler jeg ikke altid på den = I do not always trust it

In Danish, it is very common to put the if-clause first, just like in English.

This is because Danish uses verb-second word order in main clauses.

When the sentence begins with something other than the subject — here, the whole Hvis... clause — the finite verb comes before the subject in the main clause.

So the normal main clause would be:

• Jeg stoler ikke altid på den. = I do not always trust it.

But after the opening conditional clause, it becomes:

• Hvis ..., stoler jeg ikke altid på den.

This is a very important Danish pattern:

• Når jeg har tid, læser jeg.
• I dag går hun hjem tidligt.

The verb comes second in the main clause.

Stavekontrollen means the spell-check or the spell checker.

It is built from:

• stave = to spell
• kontrol = control/check

And the ending -en is the definite article attached to the noun, so:

• en stavekontrol = a spell-check
• stavekontrollen = the spell-check

Danish often puts the at the end of the noun instead of using a separate word like English does.

Foreslår means suggests.

It is the present tense of foreslå = to suggest.

So:

• stavekontrollen foreslår noget mærkeligt = the spell-check suggests something strange

A useful thing to notice is that foreslå is an irregular verb, so its forms do not look completely predictable:

• at foreslå = to suggest
• foreslår = suggests / is suggesting
• foreslog = suggested
• foreslået = suggested

Noget means something, so:

• noget mærkeligt = something strange

This is a very common Danish pattern:

• noget godt = something good
• noget vigtigt = something important
• noget underligt = something weird

The adjective often appears in the neuter form ending in -t after noget, which is why you get mærkeligt.

Because mærkeligt is the neuter singular form of the adjective mærkelig.

Basic forms:

• mærkelig = common-gender singular
• mærkeligt = neuter singular
• mærkelige = plural / definite

In the phrase noget mærkeligt, Danish uses the neuter form, so -t is added.

This happens in many similar expressions:

• et mærkeligt ord = a strange word
• noget mærkeligt = something strange

Because at stole på is a fixed expression meaning to trust or to rely on.

So Danish does not say just stole by itself in this meaning. The på belongs to the verb.

Examples:

• Jeg stoler på dig. = I trust you.
• Hun stoler ikke på ham. = She does not trust him.

In your sentence, the object pronoun den comes after på:

• stoler jeg ikke altid på den

This is completely normal because på is part of the verb phrase.

Den means it, and here it refers back to stavekontrollen.

Since stavekontrol is a common-gender noun (en stavekontrol), the pronoun used for it is den.

Compare:

• en bil → den = a car → it
• et hus → det = a house → it

So:

• stavekontrollen is common gender
• therefore: på den = it

In Danish main clauses, ikke usually comes after the finite verb and often before other adverbs or parts of the sentence.

So:

• Jeg stoler ikke altid på den.

means:

• I do not always trust it.

The placement shows that ikke negates the idea of always. In other words, the meaning is:

• It is not always the case that I trust it.

If you are an English speaker, it can help to think of Danish adverb placement as something you need to learn as a pattern rather than translate word for word.

No.

• ikke altid = not always
• aldrig = never

So the sentence does not mean that the speaker never trusts the spell-check. It means the speaker trusts it sometimes, but not in every case.

Compare:

• Jeg stoler ikke altid på den. = I do not always trust it.
• Jeg stoler aldrig på den. = I never trust it.

Because the sentence begins with a subordinate clause:

• Hvis stavekontrollen foreslår noget mærkeligt

and then moves to the main clause:

• stoler jeg ikke altid på den

In standard Danish writing, it is very common to separate these parts with a comma. This helps show the structure of the sentence clearly.

Yes. Foreslår is the present tense.

Danish present tense often covers what English expresses with simple present:

• foreslår = suggests

So the sentence is speaking about a general situation:

• If the spell-check suggests something strange, I do not always trust it.

It is not specifically about the future, even though if can refer to future situations in both English and Danish.

It would sound less natural. The standard and most natural version is:

• Jeg stoler ikke altid på den.

Danish has fairly fixed patterns for adverb placement, and ikke altid usually comes before the prepositional part på den.

So for learners, the safest choice is:

• stoler jeg ikke altid på den

rather than moving altid later in the sentence.

The structure is:

• Hvis
  • subordinate clause
• comma
• main clause with verb-second order

Broken down:

1. Hvis

   • introduces the condition

2. stavekontrollen

   • subject of the subordinate clause

3. foreslår

   • verb of the subordinate clause

4. noget mærkeligt

   • object/complement of the subordinate clause

5. stoler

   • main clause verb

6. jeg

   • main clause subject

7. ikke altid

   • negation + adverb

8. på den

   • prepositional object

So the whole pattern is:

• If X happens, then Y

which is very common in Danish.