Du kan fråga vilken lärare som helst.

It can be understood either way, depending on context.

In Swedish, kan often covers both:

• ability: you are able to ask
• permission/possibility: you may ask / you can go ahead and ask

In a sentence like Du kan fråga vilken lärare som helst, the most natural meaning is often something like You can ask any teacher, where English also leaves it a bit open between permission and practical possibility.

Because fråga comes after the modal verb kan.

In Swedish, after modal verbs such as:

• kan = can
• ska = shall / will / should
• vill = want
• måste = must
• bör = should

the next verb is normally in the bare infinitive, without att.

So:

• Du kan fråga ... = You can ask ...

not:

• Du kan att fråga ...

This is similar to English, where we say can ask, not can to ask.

Vilken means which or what kind of, but in this pattern it helps form the meaning any together with som helst.

So:

• vilken lärare som helst = any teacher whatsoever

On its own, vilken lärare? usually means which teacher?

But when you add som helst, the meaning changes:

• vilken lärare som helst = any teacher

This is a very common Swedish structure.

Som helst is the part that gives the strong any / whichever / whatsoever meaning.

So:

• vilken lärare som helst = any teacher
• literally closer to whichever teacher at all

A few more examples:

• vem som helst = anyone
• vad som helst = anything
• var som helst = anywhere
• när som helst = anytime
• vilket universitet som helst = any university
• vilka böcker som helst = any books

This is a very useful pattern to learn as a chunk.

Because lärare here is a singular en-word.

The forms are:

• vilken for singular en-words
• vilket for singular ett-words
• vilka for plural

So:

• vilken lärare som helst = any teacher
• vilket hus som helst = any house
• vilka lärare som helst = any teachers

Since en lärare is a common-gender singular noun, vilken is the correct form.

Because vilken already introduces the noun phrase.

In Swedish, you do not add en after vilken:

• vilken lärare = which teacher
• not vilken en lärare

The same applies here:

• vilken lärare som helst

Also, you do not use the definite form either:

• not vilken läraren som helst

So the noun stays in its basic singular form: lärare.

Not if you want exactly the same meaning.

Compare:

• någon lärare = some teacher / some teacher or other
• vilken lärare som helst = any teacher whatsoever

Någon lärare sounds less broad and less emphatic. It suggests some teacher, but not necessarily absolutely any teacher.

So in this sentence:

• Du kan fråga någon lärare. = You can ask some teacher / a teacher
• Du kan fråga vilken lärare som helst. = You can ask any teacher.

The second one is stronger and more general.

The basic structure is:

• Du = subject
• kan = finite verb
• fråga = infinitive/main verb
• vilken lärare som helst = object

So the pattern is:

subject + finite verb + infinitive + object

That is very normal Swedish word order in a main clause.

Breaking it down:

• Du = you
• kan = can
• fråga = ask
• vilken lärare som helst = any teacher

Usually, yes.

In modern Swedish, du is the normal singular and general you in most situations, even when speaking politely. Swedish does not use a separate polite you in the same way many other European languages do.

You may also see ni, which can mean:

• you plural
• sometimes a polite form in certain situations

But for an ordinary sentence like this, du is completely normal.

Here it is singular.

The noun lärare is one of those Swedish nouns whose singular and plural indefinite forms often look the same:

• en lärare = a teacher
• flera lärare = several teachers

In this sentence, you know it is singular because of vilken, which is singular.

If it were plural, it would be:

• Du kan fråga vilka lärare som helst. = You can ask any teachers.

Yes, that can be a very good translation in the right context.

Because kan can express permission or possibility, English translations may vary:

• You can ask any teacher
• You may ask any teacher
• Feel free to ask any teacher

The best English choice depends on tone and situation, but the Swedish sentence itself is completely natural.

In this kind of vilken/vilket/vilka + noun + som helst expression, yes.

So you get:

• vilken lärare som helst
• vilket ämne som helst
• vilka frågor som helst

And with other question words:

• vem som helst
• vad som helst
• var som helst

So it is best to learn the whole pattern, rather than translating word by word.