Learn Hardcore Catalan: No obris el transportí a menys que el veterinari sigui aquí. - Do not open the pet carrier unless the veterinarian is here.

Breakdown of No obris el transportí a menys que el veterinari sigui aquí.

Why is the command no obris and not no obre?

Because Catalan uses the present subjunctive for negative commands.

With obrir:

So:

This is very common in Catalan and Spanish, and it often surprises English speakers.

Who is being addressed here? Where is the word for you?

The sentence is addressed to one person informally, so the hidden subject is tu.

Catalan often drops subject pronouns because the verb ending already shows who the subject is. Here, obris tells you it is tu.

So the full version would be:

But Catalan normally leaves tu out unless it is needed for emphasis or contrast.

If you wanted other versions, you could say:

What does transportí mean?