Skiskoene er tørre.

Because Norwegian very often makes compound nouns by joining words together.

• ski = ski
• sko = shoe
• skisko = ski shoe / ski boot

Then the definite plural ending is added to the whole word:

• skisko = a ski shoe / ski boot
• skiskoene = the ski shoes / the ski boots

This is very normal in Norwegian. English often writes these as separate words, but Norwegian usually joins them.

Skiskoene is definite plural.

Breakdown:

• en skisko = a ski boot
• skiskoen = the ski boot
• skiskoer = ski boots
• skiskoene = the ski boots

So the sentence is talking about specific ski boots, not just ski boots in general.

In Norwegian, the idea of the is usually added to the end of the noun instead of being a separate word before it.

So:

• sko = shoe
• skoen = the shoe
• skoene = the shoes

That means skiskoene already includes the inside the word. You do not need a separate the like in English.

Er is the present tense of å være (to be).

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• vi er = we are
• de er = they are

In this sentence, er simply means are:

• Skiskoene er tørre. = The ski boots are dry.

Because the adjective has to agree with the noun.

The noun skiskoene is plural, so the adjective takes the plural/definite form tørre.

Compare:

• Skiskoen er tørr. = The ski boot is dry.
• Skiskoene er tørre. = The ski boots are dry.

This pattern is very common in Norwegian adjectives:

• Bilen er rød. = The car is red.
• Bilene er røde. = The cars are red.

So tørre is used because the thing being described is plural.

It is used in more than one situation.

Tørre is commonly used:

1. With plural nouns

   • Skoene er tørre. = The shoes are dry.

2. With definite nouns

   • Den tørre jakken = the dry jacket
   • De tørre skoene = the dry shoes

So -e is often the form you see with plural and with definite descriptions.

This is the normal basic Norwegian sentence order:

subject + verb + complement

So:

• Skiskoene = subject
• er = verb
• tørre = adjective/complement

That is directly parallel to English:

• The ski boots are dry.

So for a simple statement, the word order is very straightforward.

No, not in standard Norwegian.

It should be:

• Skiskoene er tørre.

Since skisko is a compound noun, it is written as one word. Writing ski skoene would look wrong to a Norwegian reader.

A learner-friendly way to think of it is something like:

SHEE-skoo-uh-nuh

A few useful notes:

• ski in Norwegian is usually pronounced like shee
• sko sounds roughly like skoo
• -ene in many dialects sounds like uh-nuh or eh-neh

Exact pronunciation varies somewhat by dialect, but that rough version is a good start.

They can be very close in meaning, and in many contexts both refer to a ski boot.

However:

• skisko literally means ski shoe
• skistøvel literally means ski boot

In real usage, people may prefer one or the other depending on the type of skiing, region, or personal habit. For a learner, it is enough to know that skiskoene refers to the boots/shoes used for skiing.

Yes. Literally, skisko is built from ski + shoe, but in natural English the best translation is often ski boots.

So depending on context:

• literal structure: ski shoes
• natural English meaning: ski boots

If you are translating for natural English, The ski boots are dry is usually the better choice.

Yes. It is a perfectly normal short statement.

For example, after coming in from snow or checking gear, someone might say:

• Skiskoene er tørre.
• Jakken er våt.
• Hanskene er ikke tørre ennå.

Norwegian often uses short, direct sentences like this in everyday speech.