Hi ha molta cua davant de la farmàcia aquest matí.

Hi ha is the standard way to say there is / there are in Catalan.

It is used to express that something exists or is present:

• Hi ha una farmàcia aquí. = There is a pharmacy here.
• Hi ha dues farmàcies al barri. = There are two pharmacies in the neighborhood.

So in Hi ha molta cua..., hi ha means that a queue exists / there is a lot of waiting.

In standard Catalan, hi ha is normally used for both singular and plural.

Because hi ha and està do different jobs.

• hi ha = there is / there are → it introduces something
• està = is located / is → it describes location or state

Compare:

• Hi ha molta cua davant de la farmàcia. = There is a long queue in front of the pharmacy.
• La farmàcia està davant del mercat. = The pharmacy is in front of the market.

So here the sentence is not describing where the queue is as a known thing; it is saying that the queue exists there.

Because molt has to agree with the noun it modifies.

The forms are:

• molt = masculine singular
• molta = feminine singular
• molts = masculine plural
• moltes = feminine plural

The noun cua is feminine singular, so you need molta cua.

Because cua here is being used as a kind of collective or mass idea: a lot of queue, meaning a long line / a lot of people waiting in line.

Catalan often uses the singular in this kind of expression:

• Hi ha molta cua. = There’s a long queue / There are lots of people waiting.

If you meant several separate lines, then plural would make sense:

• Hi ha moltes cues. = There are many queues.

Cua can mean:

• tail
• queue / line

In this sentence, because of the context davant de la farmàcia, it clearly means queue / line.

A very useful expression is:

• fer cua = to queue / to stand in line

Example:

• Hem de fer cua. = We have to stand in line.

Yes. Both are natural, but they focus slightly differently:

• Hi ha molta cua = there is a lot of queuing / a lot of line
• Hi ha una cua molt llarga = there is a very long line

So the original sentence sounds very natural and idiomatic, especially in everyday speech.

Because davant de is the normal Catalan expression for physical position meaning in front of.

Examples:

• davant de la farmàcia = in front of the pharmacy
• davant de casa = in front of the house

It is best learned as a fixed expression: davant de.

Catalan only contracts de with some articles:

• de + el = del
• de + els = dels

But there is no contraction with la or les:

• de la farmàcia
• de les botigues

So:

• davant del mercat
• davant de la farmàcia

Both are correct; they just depend on the gender and number of the noun.

Because Catalan often uses time expressions like this directly, with no preposition:

• aquest matí = this morning
• aquesta tarda = this afternoon
• aquesta nit = tonight / this night

So aquest matí works as a complete time expression by itself.

They are not the same:

• aquest matí = this morning → one specific morning
• al matí = in the morning / in the mornings → general or habitual time

Compare:

• Aquest matí hi ha molta cua. = This morning there is a long queue.
• Al matí hi ha molta cua. = In the morning / In the mornings there is a long queue.

Yes. Catalan allows some flexibility, especially with time expressions.

You can say:

• Hi ha molta cua davant de la farmàcia aquest matí.
• Aquest matí hi ha molta cua davant de la farmàcia.

Both are correct. Putting aquest matí first gives more emphasis to the time.

They show where the stress falls:

• farmàcia → stress on mà
• matí → stress on tí

So the accents help with correct pronunciation as well as spelling.