Hun vasker laken og putevar hver lørdag morgen.

Vasker is the present tense of å vaske = to wash.

So the sentence is in the present tense, which is very natural for a habitual action:

• Hun vasker ... hver lørdag morgen = she does this regularly

Norwegian uses the present tense for routines much like English does:

• Jeg jobber hver dag = I work every day
• Hun vasker laken ... hver lørdag morgen = She washes sheets ... every Saturday morning

No. In Norwegian, verbs do not change according to the subject the way they do in English.

You say:

• jeg vasker
• du vasker
• hun vasker
• vi vasker

So unlike English, there is no special -s form for he/she/it.

Because the sentence is talking about these things in an indefinite, general sense rather than pointing to specific ones.

In English, we also usually do this with plural nouns:

• She washes sheets and pillowcases not
• She washes the sheets and the pillowcases unless we mean specific ones

In Norwegian:

• laken og putevar = sheets and pillowcases, in general
• lakenene og putevarene = the sheets and the pillowcases, specific ones

If you meant one sheet and one pillowcase, you would normally say:

• et laken og et putevar

Here they are understood as plural from the meaning and context.

A tricky thing for learners is that both of these nouns often have the same form in indefinite singular and indefinite plural:

For laken:

• et laken = a sheet
• flere laken = several sheets

For putevar:

• et putevar = a pillowcase
• flere putevar = several pillowcases

So the form alone does not always tell you singular or plural. Context does.

Hver means every or each.

After hver, Norwegian normally uses a singular noun:

• hver dag = every day
• hver uke = every week
• hver lørdag = every Saturday

So hver lørdag morgen is completely normal. English works similarly:

• every Saturday morning not
• every Saturdays morning

Because Norwegian often uses time expressions without a preposition, especially in common phrases like this one.

So:

• hver lørdag morgen = every Saturday morning

Compare:

• på lørdag = on Saturday, meaning one specific Saturday
• om morgenen = in the morning, in a more general sense

Here, hver lørdag morgen is a compact time phrase meaning every Saturday morning.

That is a very normal Norwegian word order in a main clause:

subject + verb + object + time expression

So:

• Hun
  • vasker
    • laken og putevar
      • hver lørdag morgen

This is often the most neutral way to say it.

Yes:

• Hver lørdag morgen vasker hun laken og putevar.

That is also correct.

But when you move something to the front in a Norwegian main clause, the verb must still stay in second position. This is the famous V2 rule.

So you say:

• Hver lørdag morgen vasker hun ...

not

• Hver lørdag morgen hun vasker ...

Putevar means pillowcase.

It is a compound noun:

• pute = pillow
• var = cover/case

Norwegian uses compound words very often, so learning to recognize them is very helpful.

Then you would usually use the definite forms:

• Hun vasker lakenene og putevarene hver lørdag morgen.

That means She washes the sheets and the pillowcases every Saturday morning.

If you meant one specific sheet and one specific pillowcase, you could say:

• Hun vasker lakenet og putevaret hver lørdag morgen.

So the original sentence sounds more general/indefinite, while these forms sound more specific.