במלתחה יש פריטים עונתיים.

יש is the Hebrew existential word for there is / there are.

So the structure is:

במלתחה יש פריטים עונתיים
= In the wardrobe/cloakroom, there are seasonal items

A useful point: יש does not change for singular vs. plural. You use יש with both פריט and פריטים.

In this kind of sentence, Hebrew usually does not use a present-tense verb like English is/are. Instead, it uses יש to express existence.

So English says:

There are seasonal items...

Hebrew says, more literally:

There exist seasonal items...

That is completely normal Hebrew.

Hebrew often puts the location first when setting the scene or introducing where something exists.

So:

במלתחה יש פריטים עונתיים
means In the wardrobe/cloakroom, there are seasonal items

You could also say:

יש במלתחה פריטים עונתיים

That is also grammatical. Starting with במלתחה just puts the focus on the place first.

In ordinary unpointed Hebrew spelling, במלתחה can represent either one, depending on context.

It is made from the preposition ב־ meaning in / at plus מלתחה.

In Hebrew, when ב־ combines with the definite article ה־, the article is absorbed into the preposition. In fully pointed Hebrew, the pronunciation would show the difference more clearly, but in normal everyday spelling the two often look the same.

So context tells you whether it means:

• in a wardrobe/cloakroom
• in the wardrobe/cloakroom

Because Hebrew adjectives normally come after the noun they describe.

So:

• פריטים עונתיים = seasonal items
• literally: items seasonal

This is the standard word order in Hebrew.

Hebrew adjectives must agree with the noun in:

• gender
• number
• definiteness

Here, פריטים is:

• masculine
• plural
• indefinite

So the adjective must also be:

• masculine
• plural
• indefinite

That is why the adjective is עונתיים.

Compare:

• פריט עונתי = a seasonal item
• פריטים עונתיים = seasonal items
• הפריטים העונתיים = the seasonal items

Notice that in the definite form, both the noun and the adjective take ה־.

No. Here it is not the dual.

The singular adjective is עונתי. Adjectives ending in ־י often form the masculine plural as ־יים.

So:

• עונתי → עונתיים
• compare: ישראלי → ישראליים

Even though ־יים can sometimes be the dual ending in other words, here it is just the regular masculine plural pattern for an adjective ending in ־י.

מלתחה can mean different but related things depending on context, such as:

• wardrobe
• closet area
• cloakroom
• changing-room storage area

So the best English translation depends on the situation. The grammar of the Hebrew sentence stays the same either way.

Yes. ישנם is a more formal or literary alternative sometimes used with plural nouns.

So these are both possible:

• במלתחה יש פריטים עונתיים
• במלתחה ישנם פריטים עונתיים

In everyday modern Hebrew, יש is much more common and more natural in speech.

You replace יש with אין:

במלתחה אין פריטים עונתיים

That means:

There are no seasonal items in the wardrobe/cloakroom.

This is a very common pattern:

• יש = there is / there are
• אין = there is not / there are not / there is no / there are no