La mosquitera és a la tenda de campanya.

Because both mosquitera and tenda are feminine singular nouns in Catalan, so they take the feminine singular article la.

A rough pattern that often helps learners is that many nouns ending in -a are feminine, although that is not a universal rule. Here it works:

• la mosquitera
• la tenda

If they were plural, you would get les mosquiteres and les tendes.

This is a very common question because English just uses is, while Catalan has both ser and estar.

In standard Catalan, ser is often used for straightforward location, especially when you are simply saying where something is. So La mosquitera és a la tenda de campanya is natural.

You may also hear estar in everyday speech, especially in some dialects or when the speaker wants to stress the current position or situation. So La mosquitera està a la tenda de campanya may also be heard, but és is perfectly normal here.

A is a preposition that can mean to, at, or in, depending on context.
La is the feminine singular definite article, meaning the.

So a la tenda de campanya is literally something like at the tent or in the tent, depending on how you interpret the place relation.

Catalan only contracts certain combinations.

For example:

• a + el = al
• de + el = del

But with la, there is normally no contraction:

• a + la = a la
• de + la = de la

So a la tenda is exactly what you should expect.

Catalan often uses a for location in places where English would use in or at.

So a la tenda de campanya is very normal.
You may also come across en la tenda de campanya in some contexts or varieties, but a is extremely common and natural here.

For an English speaker, the easiest habit to build is: do not expect Catalan prepositions to match English one-for-one.

Tenda de campanya is the normal Catalan expression for tent in the camping sense.

Literally, it is built like tent of camping/campaign, but you should learn it as a set phrase:

• tenda = tent
• de campanya = camping / field / campaign-related

Catalan often uses de + noun where English uses a compound noun. So instead of putting two nouns directly together, Catalan links them with de.

In many situations, it can be understood as in the tent from context. Catalan a is broader than English at.

If you want to make inside very explicit, you can say:

• dins de la tenda de campanya = inside the tent

So the original sentence is natural, but dins de is more precise if that distinction matters.

A simple English-friendly approximation is:

• mosquitera → mos-kee-TE-ra
• tenda → TEN-da
• campanya → cam-PA-nya

The key detail is ny in campanya. It sounds like the ny in canyon.

Also, és has the stress on the only syllable, and the accent mark shows that it is pronounced clearly as es.

Because the place is already stated explicitly: a la tenda de campanya.

In Catalan, hi often replaces a place expression, like there in English. For example:

• La mosquitera hi és. = The mosquito net is there.

But when the full location is already present, you do not need hi:

• La mosquitera és a la tenda de campanya.

So the sentence is complete and natural without it.

Yes, but the given order is the most neutral and straightforward:

• La mosquitera = subject
• és = verb
• a la tenda de campanya = location

That is the standard, unmarked way to say it.

Catalan can move parts of the sentence for emphasis, but for a learner, this version is the best model to follow first.