Leieforholdet begynner neste måned.

Leieforholdet is a compound noun:

• leie = rent, rental, hire
• forhold = relationship, arrangement, situation

Together, leieforhold means something like tenancy, rental arrangement, or lease relationship, depending on context.

The ending -et makes it definite, so leieforholdet means the tenancy or the rental agreement/arrangement.

In Norwegian, the definite article is usually added to the end of the noun.

So:

• et leieforhold = a tenancy / a rental arrangement
• leieforholdet = the tenancy / the rental arrangement

This is very normal in Norwegian. English uses a separate word, but Norwegian often uses a suffix instead.

Because leieforhold is a neuter noun.

In Norwegian, singular definite endings usually look like this:

• masculine: -en
• feminine: -a or sometimes -en
• neuter: -et

So:

• et leieforhold = an indefinite neuter noun
• leieforholdet = the definite singular form

Norwegian often uses the present tense to talk about the future when the time is already clear from the sentence.

Here, neste måned tells you when it happens, so begynner is perfectly natural.

This works much like English in sentences such as:

• The course starts next week
• The train leaves tomorrow

So Leieforholdet begynner neste måned is a normal way to express future time in Norwegian.

Yes, you could.

• Leieforholdet begynner neste måned = neutral, natural, straightforward
• Leieforholdet skal begynne neste måned = a bit more like is going to begin or is supposed to begin

The version with just the present tense is often the most natural in everyday Norwegian when the future time is already stated.

Because Norwegian often uses the simpler form neste + noun in time expressions.

So:

• neste måned = next month
• neste uke = next week
• neste år = next year

Den neste måneden is possible, but it usually sounds more specific, more emphatic, or more like the following month in a particular context.

For a basic time expression, neste måned is the normal choice.

In Norwegian time expressions, the noun is often left in the indefinite form after words like neste.

So even though English says next month, Norwegian does not normally make month definite there.

Compare:

• neste måned
• forrige uke
• i år

This is just the usual Norwegian pattern for many time expressions.

The structure is:

• Leieforholdet = subject
• begynner = verb
• neste måned = time expression

So it is basically:

Subject + verb + time expression

This is a very normal Norwegian sentence pattern.

Yes:

Neste måned begynner leieforholdet.

That is also correct.

When Norwegian starts a main clause with something other than the subject, the verb usually comes in the second position. This is the V2 rule.

So:

• Leieforholdet begynner neste måned.
• Neste måned begynner leieforholdet.

Both are correct, but the emphasis is slightly different. Starting with Neste måned puts more focus on the time.

Yes, often it can.

• Leieforholdet begynner neste måned
• Leieforholdet starter neste måned

Both are understandable and natural.

Begynner is often a little more neutral and general.
Starter can sound slightly more direct or practical, but in this sentence the difference is small.

Not in the personal or romantic sense.

Forhold is a broad word that can mean relationship, condition, situation, or arrangement, depending on context.

In the compound leieforhold, it refers to a legal or practical rental arrangement between parties, not an emotional relationship.

So here it is much closer to tenancy or rental arrangement than to relationship in everyday English.